Question

Some fruit flies are born with curly wings which makes them unable to fly. It has been shown that curly wings are caused by a dominant gene which can be represented by the symbol W, while the recessive normal wing gene is represented by the symbol w. If a parent fly with the genotype WW is crossed with a parent of the genotype Ww, what percentage the offspring will have curly wings?

Answer 1

100%.

All offspring will get a W from the WW parent and either W or w from the Ww parent, so genotypes are 50% WW and 50% Ww — both express the dominant curly-wing trait.