Question

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

X R Y
X R X r
X r X r
X r Y

Answer 1

XrY

Step-by-step explanation:

r is the recessive allele that codes for white eyes present in the X chromosome and in males there is only one X chromosome (XY codes for male). Therefore, XrY is the genotype that represents a white-eyed male fruit fly.