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Unformatted text preview: and color assorted independently, giving rise to precise ratios of progeny. To explain independent assortment, we noted that the genes inuencing color and texture resided on different chromosomes, and that different chromosome pairs behave independently at meiosis. But what happens when allele pairs of different genes are on Unseen distribution of crossovers Meiocyte 1 A a B b Few recombinants Short map distance Numerous recombinants Long map distance C c locus locus locus Meiocyte 2 Meiocyte 3 Meiocyte 4 etc. Chromosome map CHAPTER OVERVIEW Figure Figure 4-1 Crossovers produce recombinant chromatids whose frequency can be used to map genes on a chromosome. 44200_04_p115-150 3/4/04 10:36 AM Page 116...
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- Spring '08