In Drosophila White eyes is caused by a recessive allele r l

In Drosophila. White eyes is caused by a recessive allele (r) located on the X chromosome. The dominant allele (R) produces red eyes. Suppose a white-eyed female mates with a red-eyed male. Knowing this, complete the sentences with the correct terms. The genotype of the male is best represented as RY. The genotype or the female is best represented as rr. Among the male F_1 offspring, the predicted proportion with white eyes is 100%. Among the female Fi offspring, the predicted proportion with white eyes is 0%. Among all F_2 offspring, the predicted proportion with white eyes is______.

Solution

The genotype of the male is best represented as RY.

The genotype of the female is best represented as rr.

Among the male F1 offspring,the predicted proportion with white eyes is 100%

Among the female F1 offspring,the predicted proportion with white eyes is 0%.

Among all F2 offspring,the predicted proportion with white eyes is 50%

Explanation

F1 GENERATION Male

F2 generation Male

Female	XR	Y
Xr	XrXR red female	Xr Y white male
Xr	XrXR red female	Xr Y white male