Suppose You Are Carrying Out a Series of Crosses with an Insect

Multiple Choice

Suppose you are carrying out a series of crosses with an insect where the mechanism of sex determination is unknown. You discover a mutant female with short bristles and decide to cross it with a wild type male that has normal bristles. Half of the F₁ progeny have short bristles but all of these short-bristled F₁ progeny are males. Based on these results, a valid hypothesis would be

A) Males are ZW, females are ZZ, and short bristles are caused by a dominant allele on the Z chromosome
B) Males are ZZ, females are ZW, and short bristles are caused by a recessive allele on the Z chromosome
C) Males are ZZ, females are ZW, and short bristles are caused by a dominant allele on the W chromosome
D) Males are ZZ, females are ZW, and short bristles are caused by a dominant allele on the Z chromosome