A purebreeding female fruit fly with a yellow body is crosse

A pure-breeding female fruit fly with a yellow body is crossed to a pure-breeding male fruit fly with a gray body. All female offspring from the cross have gray bodies and all males have yellow bodies. Body color is likely a(n)________trait, and the gray allele is ________.

a. X-linked; dominant

b. X-linked; recessive

c. Autosomal; recessive

d. Autosomal; dominant

Solution

1. The body color in Fruit fly is an X-linked trait, as the body color allele is on the X chromosome. The yellow body color is recessive while the gray (tan) color is dominant. Since, the body color is located on X chromosome, so all the. Sons got yellow body color from mother.

The correct answer is X linked; dominant.