Question

What is the genotype ratio between the cross yyrr x yyrr?

Answer 1

The genotype ratio from the cross yyrr x yyrr would be 100% yyrr, as both parents are homozygous recessive for both traits, resulting in identical offspring genotypes.

Step-by-step explanation:

When crossing two yyrr individuals, we only have one type of allele for each gene. Therefore, each parent can only pass on the alleles y and r. Since both parents are homozygous recessive for both traits, all offspring will also have the genotype yyrr. Thus, the genotype ratio would be 100% yyrr or 1:0:0:0, since no other genotype is possible. In this case, there is no variation in genotype among the offspring, and so there is no need to create a Punnett square, as all offspring will be identical with regards to these traits.

Answer 2

Have you used a punnett square before? Even if yu haven't, it is pretty easy. You have a more difficult question as punnett squares go, but it is still easy. I have attached a photo for an example.