A Female Drosophila with the Mutant Phenotype a Is Crossed

Multiple Choice

A female Drosophila with the mutant phenotype a is crossed to a male who has the mutant phenotype b.In the resulting F₁ generation all females are wild-type and all males have the a mutant phenotype.Based on these results,we can conclude that the mode of inheritance of the phenotypes of interest is:

A) autosomal for a and X-linked for b.
B) dominant for a and recessive for b.
C) recessive for a and dominant for b.
D) recessive for both a and b.
E) X-linked for a and autosomal for b.