Question

In the fruit fly, normal wings (W) is dominant over the vestigial wings (w). On the crossing of two normal-winged flies, 76 normal-winged and 23 vestigial-winged offspring are produced. Which of the following would be the possible genotype of parents?

• A. WW and ww
• B. WW and Ww
• C. Ww and ww
• D. Ww and Ww
• E. WW and WW

Answer 1

The correct option is D Ww and Ww

gametes	W	w
W	WW	Ww
w	Ww	ww

On crossing two normal winged flies we get 76 normal flies and 23 vestigial flies. Two normal wing flies mean either Ww or WW. But the ratio shows more number of normal wing flies which can be possible if two heterozygous are crossed because if both the individual are homozygous dominant than no chances of vestigial wing fly. So now the cross between two Ww and Ww , the result would be 3/4 normal winged and 1/4 vestigial wings. Thus the correct answer is option D.