In Drosophila, the genes that determine the development of red (dominant) and white (recessive) eyes are localized on the X chromosome.

In Drosophila, the genes that determine the development of red (dominant) and white (recessive) eyes are localized on the X chromosome. What offspring should be expected from crossing:
1) red-eyed male and female;
2) a red-eyed female and a white-eyed male;
3) a white-eyed female and a red-eyed male?

1) a) If the female is homozygous, then in F1 red females and red males in a ratio of 1: 1;
b) if the female is heterozygous, then in F1 there are red females, red males and white males in a ratio of 2: 1: 1;
2) a) if the female is homozygous, then in F1 there are red females and red males in a 1: 1 ratio;
b) if the female is heterozygous, then in F1 there are red females, red males, white females and white males in a ratio of 1: 1: 1: 1;
3) in F1, red females and white males in a 1: 1 ratio.