Holt Modern Biology 1st Edition by John Postlethwait ,Janet Hopson

Exercise 38

DIRECTIONS: Choose the letter of the answer choice that best answers the question. A geneticist working with the fruit fly Drosophila melanogaster discovers a mutant phenotype that appears only in males who are offspring of males of the same phenotype. What does this information suggest about the mutant phenotype?
F) The trait is X-linked.
G) The trait is Y-linked.
H) The trait is autosomal dominant.
J) The trait is autosomal recessive.