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# 1: When you testcross the offspring of ccWW x CCww , you get the following results: CcWw = 135 Ccww = 430 ccWw = 390 ccww = 120 What is the frequency...

**green, straight**

**364**

**What is the map distance between B and S? You must show and clearly label ALL work to receive credit.**

**3:****Consider the map distance you just calculated in the previous question. If a green abdomen, bent antenna double mutant fly was crossed with a wild type, and you then used their offspring for a testcross, what phenotypic ratio would you expect to see in the F****2****? (You must show and clearly label ALL work in order to receive credit. **

**4:****Suppose a man carries a very uncommon dominant mutation for a deadly muscular disease that doesn't show up until people are usually over 50 years of age (he has the disease). He and his wife are expecting their first child--a girl. What is the probability she will also have the disease if...**

**(1) it is autosomal**

**(2) it is X-linked**

**(3) it is Y-linked**

**Explain each answer in detail. Assume the penetrance of the trait is 100%.**