Biology - Principles of Inheritance and Variation Question with Solution | TestHub

For all offspring in the F${}_2$ generation to have a recessive phenotype, the initial parents must be homozygous recessive for all the traits.

In the cross rryy $\times$ rryy, both parents are homozygous recessive. They will produce only one type of gamete (ry).

The F${}_1$ generation will all have the genotype rryy, which expresses the recessive phenotype.

When the F${}_1$ individuals are crossed (rryy $\times$ rryy) to produce the F${}_2$ generation, all the resulting offspring will again have the genotype rryy.

Therefore, all offspring in the F${}_2$ generation will exhibit the recessive phenotype.

Answer: rryy x rryy