Homozygous recessive - Revision history

Nnjm2 at 17:15, 22 October 2018

2018-10-22T17:15:53Z

← Older revision		Revision as of 17:15, 22 October 2018
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	~~<br>~~		See [[Recessive_gene\|Recessive Gene]]

170369765: Unnecessary Page, https://teaching.ncl.ac.uk/bms/wiki/index.php/Recessive_gene summarises this topic much more concisely

2018-10-22T16:57:00Z

Unnecessary Page, https://teaching.ncl.ac.uk/bms/wiki/index.php/Recessive_gene summarises this topic much more concisely

← Older revision		Revision as of 16:57, 22 October 2018
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	Homozygous is a term used in genetics to describe the [[Genome]] of an individual organism were two indistinguishable [[Allele]] are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same [[Phenotypes]]. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are [[Recessive]] or [[Dominant]].		<br>

	[[Recessive]] is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its [[Expression]] would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a [[Heterozygous]] gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or [[Mutations]] in organisms such as [[Cystic Fibrosis]] (lack of [[CFTR\|CFTR]]), Albinism (lack of the pigment melanin) and Tay-Sachs disease (causes damage to the nervous system and at the moment always fatal) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves. Almost always, the disorders that are expressed due to the recessive genotype are fatal. In the case of [[Cystic Fibrosis\|Cystic Fibrosis]], treatment can improve life expectancy minorly, but ultimately, the patient dies. Infants having [[Sickle cell anaemia\|Sickle Cell Anaemia]] survive only for a couple of days after birth.

	Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>

	~~=== References ===~~

	~~<references /~~>

Nnjm2 at 13:42, 1 December 2015

2015-12-01T13:42:44Z

← Older revision		Revision as of 13:42, 1 December 2015
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	Homozygous is a term used in genetics to describe the [[Genome]] of an individual organism were two indistinguishable [[Allele]] are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same [[Phenotypes]]. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are [[Recessive]] or [[Dominant]].~~<br>~~[[Recessive]] is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its [[Expression]] would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a [[Heterozygous]] gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or [[Mutations]] in organisms such as [[Cystic Fibrosis]] (lack of [[CFTR\|CFTR]]), Albinism (lack of the pigment melanin) and Tay-Sachs disease (causes damage to the nervous system and at the moment always fatal) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves. Almost always, the disorders that are expressed due to the recessive genotype are fatal. In the case of [[Cystic Fibrosis\|Cystic Fibrosis]], treatment can improve life expectancy minorly, but ultimately, the patient dies. Infants having [[Sickle cell anaemia\|Sickle Cell Anaemia]] survive only for a couple of days after birth.		Homozygous is a term used in genetics to describe the [[Genome]] of an individual organism were two indistinguishable [[Allele]] are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same [[Phenotypes]]. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are [[Recessive]] or [[Dominant]].

			[[Recessive]] is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its [[Expression]] would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a [[Heterozygous]] gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or [[Mutations]] in organisms such as [[Cystic Fibrosis]] (lack of [[CFTR\|CFTR]]), Albinism (lack of the pigment melanin) and Tay-Sachs disease (causes damage to the nervous system and at the moment always fatal) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves. Almost always, the disorders that are expressed due to the recessive genotype are fatal. In the case of [[Cystic Fibrosis\|Cystic Fibrosis]], treatment can improve life expectancy minorly, but ultimately, the patient dies. Infants having [[Sickle cell anaemia\|Sickle Cell Anaemia]] survive only for a couple of days after birth.

	Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>		Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>

150279448 at 12:36, 1 December 2015

2015-12-01T12:36:25Z

← Older revision		Revision as of 12:36, 1 December 2015
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	Homozygous is a term used in genetics to describe the [[Genome]] of an individual organism were two indistinguishable [[Allele]] are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same [[Phenotypes]]. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are [[Recessive]] or [[Dominant]].<br>[[Recessive]] is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its [[Expression]] would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a [[Heterozygous]] gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or [[Mutations]] in organisms such as [[Cystic Fibrosis]] (lack of [[CFTR\|CFTR]]) ~~and~~ Albinism (lack of the pigment melanin) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves. Almost always, the disorders that are expressed due to the recessive genotype are fatal. In the case of [[~~Cystic_Fibrosis~~\|Cystic Fibrosis]], treatment can improve life expectancy minorly, but ultimately, the patient dies. Infants having [[~~Sickle_cell_anaemia~~\|Sickle Cell Anaemia]] survive only for a couple of days after birth.		Homozygous is a term used in genetics to describe the [[Genome]] of an individual organism were two indistinguishable [[Allele]] are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same [[Phenotypes]]. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are [[Recessive]] or [[Dominant]].<br>[[Recessive]] is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its [[Expression]] would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a [[Heterozygous]] gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or [[Mutations]] in organisms such as [[Cystic Fibrosis]] (lack of [[CFTR\|CFTR]]), Albinism (lack of the pigment melanin) and Tay-Sachs disease (causes damage to the nervous system and at the moment always fatal) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves. Almost always, the disorders that are expressed due to the recessive genotype are fatal. In the case of [[Cystic Fibrosis\|Cystic Fibrosis]], treatment can improve life expectancy minorly, but ultimately, the patient dies. Infants having [[Sickle cell anaemia\|Sickle Cell Anaemia]] survive only for a couple of days after birth.

	Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>		Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>

Nnjm2 at 06:30, 23 November 2014

2014-11-23T06:30:12Z

← Older revision		Revision as of 06:30, 23 November 2014
Line 1:		Line 1:
	Homozygous is a term used in genetics to describe the [[Genome]] of an individual organism were two indistinguishable [[Allele]] are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same [[Phenotypes]]. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are [[Recessive]] or [[Dominant]].<br>[[Recessive]] is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its [[Expression]] would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a [[Heterozygous]] gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or [[Mutations]] in organisms such as [[Cystic Fibrosis]] (lack of CFTR) and Albinism (lack of the pigment melanin) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves. Almost always, the disorders that are expressed due to the recessive genotype are fatal. In the case of [~~https://teaching.ncl.ac.uk/bms/wiki/index.php/Cystic_fibrosis~~ Cystic Fibrosis]~~ ~~, treatment can improve life expectancy minorly, but ultimately, the patient dies. Infants having [~~https://teaching.ncl.ac.uk/bms/wiki/index.php/~~Sickle_cell_anaemia Sickle Cell Anaemia] survive only for a couple of days after birth.		Homozygous is a term used in genetics to describe the [[Genome]] of an individual organism were two indistinguishable [[Allele]] are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same [[Phenotypes]]. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are [[Recessive]] or [[Dominant]].<br>[[Recessive]] is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its [[Expression]] would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a [[Heterozygous]] gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or [[Mutations]] in organisms such as [[Cystic Fibrosis]] (lack of [[CFTR\|CFTR]]) and Albinism (lack of the pigment melanin) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves. Almost always, the disorders that are expressed due to the recessive genotype are fatal. In the case of [[Cystic_Fibrosis\|Cystic Fibrosis]], treatment can improve life expectancy minorly, but ultimately, the patient dies. Infants having [[Sickle_cell_anaemia\|Sickle Cell Anaemia]] survive only for a couple of days after birth.

	Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>		Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>

140632152 at 18:12, 22 November 2014

2014-11-22T18:12:23Z

← Older revision		Revision as of 18:12, 22 November 2014
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	Homozygous is a term used in genetics to describe the [[Genome]] of an individual organism were two indistinguishable [[Allele]] are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same [[Phenotypes]]. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are [[Recessive]] or [[Dominant]].<br>[[Recessive]] is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its [[Expression]] would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a [[Heterozygous]] gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or [[Mutations]] in organisms such as [[Cystic Fibrosis]] (lack of CFTR) and Albinism (lack of the pigment melanin) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves.~~<br>~~Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>		Homozygous is a term used in genetics to describe the [[Genome]] of an individual organism were two indistinguishable [[Allele]] are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same [[Phenotypes]]. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are [[Recessive]] or [[Dominant]].<br>[[Recessive]] is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its [[Expression]] would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a [[Heterozygous]] gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or [[Mutations]] in organisms such as [[Cystic Fibrosis]] (lack of CFTR) and Albinism (lack of the pigment melanin) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves. Almost always, the disorders that are expressed due to the recessive genotype are fatal. In the case of [https://teaching.ncl.ac.uk/bms/wiki/index.php/Cystic_fibrosis Cystic Fibrosis] , treatment can improve life expectancy minorly, but ultimately, the patient dies. Infants having [https://teaching.ncl.ac.uk/bms/wiki/index.php/Sickle_cell_anaemia Sickle Cell Anaemia] survive only for a couple of days after birth.

			Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>

	=== References ===		=== References ===

	<references />		<references />

Nnjm2 at 08:01, 16 November 2013

2013-11-16T08:01:16Z

← Older revision		Revision as of 08:01, 16 November 2013
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	Homozygous is a term used in genetics to describe the [[~~genome~~]] of an individual organism were two indistinguishable [[~~allele~~]] are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same [[~~phenotypes~~]]. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are [[~~recessive~~]] or [[~~dominant~~]].<br>[[Recessive]] is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its [[~~expression~~]] would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a [[~~heterozygous~~]] gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or [[~~mutations~~]] in organisms such as [[Cystic Fibrosis]] (lack of CFTR) and Albinism (lack of the pigment melanin) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves.<br>Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>		Homozygous is a term used in genetics to describe the [[Genome]] of an individual organism were two indistinguishable [[Allele]] are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same [[Phenotypes]]. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are [[Recessive]] or [[Dominant]].<br>[[Recessive]] is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its [[Expression]] would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a [[Heterozygous]] gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or [[Mutations]] in organisms such as [[Cystic Fibrosis]] (lack of CFTR) and Albinism (lack of the pigment melanin) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves.<br>Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>

	=== References ===		=== References ===

	~~ ~~<references />		<references />

130076315 at 11:08, 14 November 2013

2013-11-14T11:08:40Z

← Older revision		Revision as of 11:08, 14 November 2013
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	Homozygous is a term used in genetics to describe the genome of an individual organism were two indistinguishable ~~alleles~~ are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same phenotypes. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are recessive or dominant.<br>Recessive is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its expression would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a heterozygous gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or mutations in organisms such as Cystic Fibrosis (lack of CFTR) and Albinism (lack of the pigment melanin) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves.<br>Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>		Homozygous is a term used in genetics to describe the [[genome]] of an individual organism were two indistinguishable [[allele]] are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same [[phenotypes]]. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are [[recessive]] or [[dominant]].<br>[[Recessive]] is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its [[expression]] would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a [[heterozygous]] gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or [[mutations]] in organisms such as [[Cystic Fibrosis]] (lack of CFTR) and Albinism (lack of the pigment melanin) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves.<br>Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>

	=== References ===		=== References ===

	<references />		<references />

130076315 at 11:00, 14 November 2013

2013-11-14T11:00:54Z

← Older revision		Revision as of 11:00, 14 November 2013
Line 1:		Line 1:
	Homozygous is a term used in genetics to describe the genome of an individual organism were two indistinguishable alleles are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same phenotypes. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are recessive or dominant.<br>Recessive is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its expression would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a heterozygous gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or mutations in organisms such as Cystic Fibrosis (lack of CFTR) and Albinism (lack of the pigment melanin) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves.<br>Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>		Homozygous is a term used in genetics to describe the genome of an individual organism were two indistinguishable alleles are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same phenotypes. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are recessive or dominant.<br>Recessive is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its expression would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a heterozygous gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or mutations in organisms such as Cystic Fibrosis (lack of CFTR) and Albinism (lack of the pigment melanin) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves.<br>Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>

	=== References ===		=== References ===

	1. <references />		<references />

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Homozygous is a term used in genetics to describe the genome of an individual organism were two indistinguishable alleles are found on the locus of the same gene. The alleles are genetically very similar if not identical and so code for the same things and express the same phenotypes. If both alleles are the same then the phenotype of these alleles will be shown in the individual whether the alleles are recessive or dominant.<br>Recessive is also a term used in genetics which describes the characteristics and type of allele present in the genotype of an individual. A recessive allele is where homozygosity is required to shown the alleles phenotype in the organism as if only one recessive allele is present its expression would be suppressed. In other words two copies of the recessive allele are required in order to show the characteristics they express as the organisms phenotype. If the organism were to have a heterozygous gene with one dominant and one recessive allele then the dominant allele’s phenotype would be expressed and this would be at the expense of the recessive allele as its phenotype would be masked. There are many examples of recessive alleles that can cause disease or mutations in organisms such as Cystic Fibrosis (lack of CFTR) and Albinism (lack of the pigment melanin) but the recessive alleles that cause these mutations are very rare and only occur if both parent organisms are carriers of the recessive allele or possess the mutation themselves.<br>Therefore Homozygous Recessive refers to two indistinguishable copies of the same recessive allele found on a locus of an individual’s genome. Due to it being Homozygous the phenotype characteristics of the recessive alleles will be shown in the organism and the recessive gene will be expressed<ref>Daniel L. Hartyl and Maryellen Ruvolo, 2012, Genetics: Analysis of Genes and Genomes, 8th Edition, Jones and Bartlett Learning</ref>.<br>

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