Bidirectional Replication: Difference between revisions
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Bidirectional replication is a method of DNA replication used by many organisms e.g. [[Paramecium Cells|Paramecium]]. Bidirectional replication consists of the linear [[Chromosome|chromosome replicating]] in two directions, starting from one point, the replication origin. The [[Chromosome|chromosome also]] has two replication forks which are the regions where [[Nucleotides|nucleotides]] are actively added to growing strands. The linear chromosomes have several origins of replication and two replication forks for each of these, replication therefore occurs much more quickly. At all replication origins, replication takes place in a bidirectional format which results in the formation of | Bidirectional replication is a method of [[DNA|DNA]] replication used by many organisms e.g. [[Paramecium Cells|Paramecium]]. Bidirectional replication consists of the linear [[Chromosome|chromosome replicating]] in two directions, starting from one point, the replication origin. The [[Chromosome|chromosome also]] has two replication forks which are the regions where [[Nucleotides|nucleotides]] are actively added to growing strands. The linear chromosomes have several origins of replication and two [[replication fork|replication forks]] for each of these, replication therefore occurs much more quickly. At all replication origins, replication takes place in a bidirectional format which results in the formation of ‘[[replication bubble|replication bubbles]]’. These bubbles grow in size as replication continues. Eventually, two replication forks (at each end of a bubble) meet, at which point they fuse together producing a larger bubble. Ultimately, all the replication bubbles along the [[chromosome|chromosome]] merge into one large bubble joint only at the [[telomere|telomeres]]; these split to give two identical strands of [[DNA|DNA]]. This process continues to produce a many strands of DNA which are then passed on to [[Daughter cells|daughter cells]] <ref>Ruvolo, D. L. (2012). Eighth Edition Genetics Analysis of Genes and Genomes. Burlington: Jones & Bartlett Learning.</ref><br> | ||
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Revision as of 16:12, 29 November 2012
Bidirectional replication is a method of DNA replication used by many organisms e.g. Paramecium. Bidirectional replication consists of the linear chromosome replicating in two directions, starting from one point, the replication origin. The chromosome also has two replication forks which are the regions where nucleotides are actively added to growing strands. The linear chromosomes have several origins of replication and two replication forks for each of these, replication therefore occurs much more quickly. At all replication origins, replication takes place in a bidirectional format which results in the formation of ‘replication bubbles’. These bubbles grow in size as replication continues. Eventually, two replication forks (at each end of a bubble) meet, at which point they fuse together producing a larger bubble. Ultimately, all the replication bubbles along the chromosome merge into one large bubble joint only at the telomeres; these split to give two identical strands of DNA. This process continues to produce a many strands of DNA which are then passed on to daughter cells [1]
References
- ↑ Ruvolo, D. L. (2012). Eighth Edition Genetics Analysis of Genes and Genomes. Burlington: Jones & Bartlett Learning.