Question

Suppose you are carrying out a series of crosses with an insect where the mechanism of determination is unknown. You discover a mutant female with short wings and decide to cross it with a wild-type male that has normal wings. None of the F₁ progeny have short wings but among the F₂ progeny 26% have short wings. However, all of these short-winged F₂ progeny are females. Based on these results, a valid hypothesis would be _________.a. Females are XX. males are XY and black wing scales are caused by n recessive allele on the X chromosome b. Females are XX. males are XY and black wing scales are caused by a dominant allele on the X chromosome. c. Females are ZW. males are ZZ and black wing scales are caused by a recessive allele on the Z chromosome. d. Females are ZW, males are 11 and black wing scales are caused by a dominant allele on the Z chromosome.

Answer 1

Males are ZZ, females are ZW, and short bristles are caused by a dominant allele on the Z chromosome