Review Session 4 Key

Review Session 4 Key - Review session problems for Oct. 23...

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Review session problems for Oct. 23 2011 1.) In a species of cats, eye color can be gray, blue, green or brown. Lines that are true-breeding for each eye color have been established. Results of crosses between individuals from these true-breeding lines are as follows: Cross # eye colors of true-breeding parents: F1 progeny eye colors: 1 green x gray all green 2 green x brown all green 3 green x blue all green 4 gray x brown all green a. Which of the following are demonstrated by the results shown in the table above? Circle all that apply (12 pts): >i. dominance ii. pleiotropy >iii. complementation iv. epistasis v. variable expressivity vi. incomplete penetrance b. Matings between male and female F 1 progeny of cross 4 produced 100 F 2 cats as follows: 59 had green eyes, 16 had gray eyes, 20 had brown eyes, and 5 had blue eyes. When blue-eyed cats from this F 2 population were crossed with cats from the true-breeding blue-eyed line, all the progeny had blue eyes. Based on these results, if male and female F 1 progeny of cross #3 are mated with each other, what eye color phenotypes do you expect to find among the F 2 progeny (8 pts)? The information provided tells you that gray and brown are both recessive to green, and that individuals homozygous for both the gray and brown eye mutations have blue eyes. You can infer this because you see blue eyed cats at approximately the frequency expected for double homozygous recessives in the F2 population derived from cross #4. Since the
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Review Session 4 Key - Review session problems for Oct. 23...

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