Introduction to Genetic Analysis 124

Introduction to Genetic Analysis 124 - 44200_04_p115-150...

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Unformatted text preview: 44200_04_p115-150 3/4/04 2:19 PM Page 123 4.2 Recombination 123 Meiotic recombination between unlinked genes by independent assortment A A P B B a a b b A Gametes B a b A a B b a a b b (Tester) Meiotic diploid (F1) 1 4 A a a a A a a a B Parental type b b Parental type www. ANIMATED ART 1 4 Testcross progeny 1 4 b b Recombinant b B Recombinant 1 4 b Figure 4-8 Recombination between unlinked genes by independent assortment. This diagram shows two chromosome pairs of a diploid organism with A and a on one pair and B and b on the other. Independent assortment produces a recombinant frequency of 50 percent. Note that we could represent the haploid situation by removing the parental (P) cross and the testcross. Meiotic recombination between linked genes by crossing-over Meiotic chromosomes A B B b b Meiotic products A A a a B Meioses with no crossover between the genes Parental A a a B Parental b Parental b Parental A B B b b A A a a B www. ANIMATED ART Meioses with a crossover between the genes Parental A a a b Recombinant B b Recombinant Parental Figure 4-9 Recombination between linked genes by crossing-over. Recombinants arise from meioses in which a crossover occurs between nonsister chromatids in a region under study. ...
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