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