Question

Only females of the progany red eyed if the parent Drosophila are

• A. Male white eyed and female heterozygous
• B. Male red eyed and female white eyed
• C. Male red eyed and female heterozygous red eyed
• D. Male white eyed and female homozygous red eyed

Answer 1

The correct option is B Male red eyed and female white eyed

In order to make only the female progeny red eyed and the male progeny white eyed, the basic principle of criss cross inheritance should be kept in mind. The father transmits only the Y sex chromosome to the sons and females contribute the X chromosome. Now as the eye colour is a X linked property, so the parents should be having the opposite characteristics as compared to the progeny. So the male should be red eyed and the female should be white eyed. The Punnett square will help in clarifying the details.

Male/Female	Xw	Xw
Xr	XwXr	XwXr
Y	XwY	XwY

So the correct option is 'Male red eyed and female white eyed'.