In fruit flies the allele for red eyes, R, is dominant. Witch genotype represents a white eyed male fruit fly

rr

Explanation:

Dominant alleles will always be visible on a creature if they are at all present, such as with brown eyes in humans (i.e. Rr or RR). People with blue eyes (or fruit flies with white eyes) possess two recessive alleles (rr), which is the only way for a recessive trait to be present.

In fruit flies, the allele for red eyes, R, is dominant. Which genotype represents a white-eyed male fruit fly?

The answer is XrXr