Question

In Drosophilia, sex determination is the same as in the human. Normal flies have bright red eyes; a certain recessive sex-linked gene is responsible for white eyes. From a pure-breeding strain of red-eyed flies, a female is selected and bred to a male from a pure-breeding strain of white-eyed flies. What will be the color of the eyes of male flies? What will be the color of the eyes of female flies?

Answer 1

ANSWER: The male flies will have red eyes, and the female flies will have red eyes.

EXPLANATION: In Drosophila, the gene for eye color is sex-linked, but the information provided doesn't mention that the selected female carries the recessive white-eyed gene. Therefore, in the absence of specific details, it's assumed that the female has red eyes, and since the male is from a pure-breeding strain of white-eyed flies, the resulting offspring will have red eyes.