Question

Given RRYY x Rryy, what will the parents be? (no links please)

Answer 1

I'm guessing the genotypes given (RRYY x Rryy) are the offspring (if this isn't the case this answer may be wrong)

RRYY has both dominant alleles. So we can safely say that the parents are both RRYY.

For Rryy :

Rr is heterozygous (the alleles are not the same), so the parents could be:

RR x rr

RR x Rr

Rr x Rr

(if you do a small punnet square, you can double check these!)

Since yy has both recessive alleles, the parent is yy as well.