Hereís how it works: The original white-eyed fly was a male, so letís write its genotype as XwY. Mate it with a red-eyed female (X+X+) and you get. . .

X+ X+

Xw X+Xw X+Xw

(red-eyed female) (red-eyed female)

Y X+Y X+Y

(red-eyed male) (red-eyed male)

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