Punnett Square

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A table used to predict the [[Phenotype|phenotype]] of the offspring of two known parent organisms. The punnett square can also be used to carry out a back cross. This is a technique where the phenotype of the offspring is used to determine the [[Genotype|genotype]] of one or both of the parental organisms.  
 
A table used to predict the [[Phenotype|phenotype]] of the offspring of two known parent organisms. The punnett square can also be used to carry out a back cross. This is a technique where the phenotype of the offspring is used to determine the [[Genotype|genotype]] of one or both of the parental organisms.  
  
A punnett square can be used in order to assess the probability of offspring inheriting a particular trait from its parents. In general, a capital letter (e.g. A) indicates a dominant allele, whilst a lower case letter (e.g. a) indicates a recessive allele.&nbsp;The assumption is made that the likelihood of inheritance of each allele from each parent will be 0.5. For example, for a parent of genotype Aa, P(A)=0.5 and P(a)=0.5. If a parent is homozygous (AA or aa), the probability of inheriting the allele will be 1<ref>http://anthro.palomar.edu/mendel/mendel_2.htm last accessed: 19/11/2015</ref>.<br>  
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A punnett square can be used in order to assess the probability of offspring inheriting a particular trait from its parents. In general, a capital letter (e.g. A) indicates a [[Dominant_allele|dominant allele]], whilst a lower case letter (e.g. a) indicates a [[Recessive_allele|recessive allele]].&nbsp;The assumption is made that the likelihood of [[Inheritance|inheritance]] of each allele from each parent will be 0.5. For example, for a parent of genotype Aa, P(A)=0.5 and P(a)=0.5. If a parent is homozygous (AA or aa), the probability of inheriting the allele will be 1<ref>http://anthro.palomar.edu/mendel/mendel_2.htm last accessed: 19/11/2015</ref>.<br>  
  
=== References ===
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=== References ===
  
 
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Latest revision as of 22:21, 5 December 2017

A Punnett Square.

Invented by Professor Reginald Crundall Punnett FRS (20 June 1875 - 3 January 1967)

A table used to predict the phenotype of the offspring of two known parent organisms. The punnett square can also be used to carry out a back cross. This is a technique where the phenotype of the offspring is used to determine the genotype of one or both of the parental organisms.

A punnett square can be used in order to assess the probability of offspring inheriting a particular trait from its parents. In general, a capital letter (e.g. A) indicates a dominant allele, whilst a lower case letter (e.g. a) indicates a recessive allele. The assumption is made that the likelihood of inheritance of each allele from each parent will be 0.5. For example, for a parent of genotype Aa, P(A)=0.5 and P(a)=0.5. If a parent is homozygous (AA or aa), the probability of inheriting the allele will be 1[1].

References

  1. http://anthro.palomar.edu/mendel/mendel_2.htm last accessed: 19/11/2015
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