In guinea pigs, rough coats (R) are dominant over smooth coats (r).
If an RR guinea pig is crossed with an Rr guinea pig, what are the possible GENOTYPE ratios of the offspring?
1. 100% Rr
2.50% RR, 50% Rr
3. 25% RR, 50% Rr, 25% rr
4.100% rough coat
5.100% smooth coat
6.50% rough coat, 50% smooth coat