Question

If you cross a white-eyed female (ww) to a red-eyed male (WY) Drosophila fly, you will see red-eyed females and white-eyed males in the F1 generation. If you cross an F1 red-eyed female to an F1 white-eyed male, what is the approximate percentage of total progeny in the F2 generation that are white-eyed males

Answer 1

25%

Step-by-step explanation:

ww gives white-eye female

WY gives red-eye male

ww x WY

F1: Ww wY Ww wY

Ww - red-eye female

wY - white-eye male

Crossing the two F1

Ww x wY

F2: Ww WY ww wY

Remember that white-eye male = wY

Percentage of wY = 1/4 or 25%

Hence, the percentage of progeny in the F2 generation that would be white-eye males = 1/4 or 25%