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They are all therefore red-eyed, but heterozygous that is, the red eye is due to one red-eye factor, not two. When the F1 are bred together, half the female gametes carry one X red chromosome, the other half one X white chromosome; half the male gametes carry one X red chromosome, the other half one Y white chromosome.
F1 Red-eyed male Red-eyed female XR XW XR YW F2 Red-eyed male Red-eyed male Red-eyed female White-eyed female XR XR XW XR XR YW XW YW Homozygous. Heterozygous. Heterozygous. Homozygous. White-eyed male Red-eyed female XW XW x XR YW F1 Red-eyed male White-eyed female XW XR XW YW F2 White-eyed male Red-eyed male White-eyed female Red-eyed female XW XW XR XW XW YW XR YW Homozygous. Heterozygous.
On p. 102 of the same volume he describes the results of crossing White Leghorn with Indian Game or Brown Leghorn, the F1 being substantially white birds with specks of black and brown, though cocks have sometimes enough red in the wings to bring them into the category known an pile.
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