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Discussion Sheet 3 Key - GENETICS(BIO 325 Spring 2008...

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GENETICS (BIO 325) Spring 2008 Discussion 3 key _____________________________________________________________________________________ 1. (i) (d) (ii) (c) 2. 2 23 different gametes. 3. (a) chromatin (b) homologous (c) scaffold (d) mammals 4. χ 2 = 16.10; the hypothesis is rejected. 5. (a) Cis conformation (b) Trans conformation 6. (a) 25% (b) 50% (c) 45% (d) 38% 7. (c) 8. (a) The proportions of gametes produced by parent 1 were: 38% a + ; b + 37% a;b 12% a + ; b 13% a;b + (b) No, because we expect 25% of each under independent assortment. (c) The two gene pairs must be linked; the %R (RF) = 12 + 13 = 25%, and the two loci are 25 map units apart on the same chromosome. (d) a + b + /a b and a b/a b 9. This is a testcross, so the ratio of meiotic products will be revealed in the phenotypes of the progeny. The progeny will be: 43% wild type 43% scarlet, spineless 7% scarlet 7% spineless 10. 32%
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11. The class asked for is one-half of one of the single-crossover classes.
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