In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If two red-eyed heterozygous flies (Rr) mate together, what are the possible genotypes of their offspring?

A. Rr only
B. RR and Rr
C. RR and rr
D. RR, Rr, and rr

Question

In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If two red-eyed heterozygous flies (Rr) mate together, what are the possible genotypes of their offspring?

A. Rr only 
B. RR and Rr
C. RR and rr
D. RR, Rr, and rr

anonymous · Answer

Create a Punnet Square:

____R____r_____
R___RR......Rr......
r____Rr........rr......

Possible combos:
RR - 25%, red eyes
Rr - 50%, red eyes
rr - 25%, sepia eyes

anonymous · Answer

thanks so much