Question

White eye is a sex linked recessive trait in Drosophila. In cross of white eyed female with normal male, what are the phenotypes of $F_1$ generation?

• A. All normal
• B. All males white eyed, all females normal
• C. 50% females and all males white eyed
• D. 50% males and 50% females white eyed

Answer 1

The correct option is B All males white eyed, all females normal

A Female Drosophila, with sex linked trat white eye is crossed with male Drosophila with normal eye. In the next generation, all males are white eyed because Y is inactive and Xchromosome with white eye is active.all females are normal because normal X chromosome is present. Flow chart.

So, the correct option is ‘all males white eyed, all females normal’.