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

25%

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%

really dont know just need some points