Question 8 - High School Biology Practice Test for the STAAR test

Gregor Mendel studied dihybrid crosses, the inheritance patterns of two different traits, in the 1860s. In pea plants, the allele for round seeds (R) is dominant to the allele for wrinkled seeds (r). The allele for yellow seeds (Y) is dominant to the allele for green seeds (y). What percentage of offspring from a RrYY x Rryy cross are expected to have both round and yellow seeds?