Question

In fruit flies, the gene for red eyes (r is dominant and the gene for sepia eyes (r is recessive. if a red-eyed heterozygous fly (rr mates with a sepia-eyed homozygous fly (rr, what are the possible genotypes of their offspring? (hint: you many want to complete a punnett square.

Answer 1

Rr and rr

Step-by-step explanation:

When doing a Punnett Square you put the parent's genetic make up on the outside of the square to determine the possible genetic make up of the offspring.

-The parents are Rr and rr

-The offspring will be: Rr, Rr, rr, rr

So the correct answer is Rr and rr

Answer 2

The answer is Rr and rr.

R - dominant allele for red eyes
r - recessive allele for sepia eyes

If a red-eyed heterozygous fly Rr mates with a sepia-eyed homozygous fly rr, the possible genotypes of the offspring are Rr (heterozygotes) and rr (recessive homozygotes).
Parents: Rr x rr
Offspring: Rr Rr rr rr

Thus, half of the offspring will have genotype RR and will have red eyes while half of the offspring will have genotype rr and will have sepia eyes.