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Given the following three point-test cross in Drospohila (female b a sh / b a sh...

Given the following three point-test cross in Drospohila (female b a sh / b a sh and male + + + /b a sh) how many different phenotypic classes would you expect to get in their offspring?

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Answer #1

The female here is b a sh / b a sh.

There are three genes here. Each of them can segregate independently or they can be linked. In either case, there is only one type of gamete that is possible. And that gamete is b a sh.

The male here is + + + / b a sh. If it is completely linked, the gametes are + + + and b a sh. If there was no or little linkage, then there can be a single cross over event resulting in the following gametes:

+ + sh / b a +

b + + / + a sh

However, there can be a double crossover event too. And this will result in the following gametes:

+ a + / b + sh

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