In fruit flies, the gene for red eyes (r) is dominant and the gene for sepia eyes (r) is recessive. if a red-eyed homozygous fly (rr) and a red-eyed heterozygous fly (rr) mate together, what are the possible genotypes of their offspring? (hint: you many want to complete a punnett square.)
rr and rr
rr only
rr and rr < i think its this one
rr, rr, and rr

Yes the answer you expected is correct. Its RR and Rr.

Explanation:

As per the given information the parent generation is as follows:

Parent: Red eyed homozygous fly (RR)   x  red eyed heterozygous fly (Rr)

Gametes: R and R , r

F1 generation : RR and Rr

The F1 generation will have only these two possible genotypes.

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