Questions 20 and 21 refer to the following scenario. A female Drosophila with re

Question

Questions 20 and 21 refer to the following scenario. A female Drosophila with red eyes and vestigial wings is crossed with a male that has white eyes and normal wings. Both lines are true-breeding.

20) What proportion of their FEMALE F1 offspring would be expected to have red eyes and normal wings?

A. 0            B. 1.0          C. ¼            D. 9/16        E. 1/16

21) Imagine that the F1 are allowed to mate with each other. What proportion of the MALE F2 offspring would be expected to have white eyes and vestigial wings?

A. 0
B. 1.0
C. 1/8
D. 9/16
E. 1/

Explanation / Answer

20. red eyes - wY, white eyes - ww; Vestigeal wings - vg, normal wings vg+

The female F1 offspring expected to have red eyes and normal wings are 1/16. Option E is correct.

21. Male F2 offspring would be expected to have white eyes and vestigeal wings would be 1/16. Option E is correct.

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