Introduction to Genetic Analysis 122

Introduction to Genetic Analysis 122 - 121 4.2...

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Unformatted text preview: 121 4.2 Recombination Therefore, for any pair of homologous chromosomes, two, three, or four chromatids can take part in crossing- over events in a single meiocyte. You might be wondering about crossovers between sister chromatids. These do occur but are rare. They do not produce new allele combinations so normally are not considered. 4.2 Recombination The production of new allele combinations is formally called recombination . Crossovers are one mechanism for recombination, and so is independent assortment. In this section we define recombination in such a way that we would recognize it in experimental results, and we lay out the way that recombination is analyzed and interpreted. Recombination is observed in a variety of biological situations, but for the present lets define it in relation to meiosis. Meiotic recombination is defined as any meiotic process that generates a haploid product with new combina- tions of the alleles carried by the haploid genotypes that united to form the dihybrid meiocyte. This seemingly com-...
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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