A scientist wants to determine whether a mutant phenotype is due to the loss of gene C or gene D, which are both deleted in a mutant fly with abnormal eyes.Mutant flies with transgenic gene C have wild-type eyes, whereas mutant flies with transgenic gene D have abnormal eyes.What can be concluded from these results?
A)Either gene C or gene D is required for normal eye development.
B)Both gene C and gene D are required for normal eye development.
C)Gene C is required for normal eye development.
D)Gene D is required for normal eye development.

Question

Quizplus · Accepted Answer

Since introducing gene C back into the mutant flies restores the wild-type eye phenotype, it indicates that the loss of gene C is responsible for the abnormal eyes. The fact that reintroducing gene D does not correct the phenotype suggests that gene D is not directly involved in the development of normal eyes in this context.

A Scientist Wants to Determine Whether a Mutant Phenotype Is