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.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.