Question

You crossed a plant with wrinkled, yellow seeds to a plant with round, green seeds. In the F1 generation you observed that all of the progeny had round, yellow seeds. What were the genotypes of the parental plants?

Answer 1

The parental genotypes for the plant with wrinkled, yellow seeds must have been rryy, and for the round, green seeds plant, it must have been RRyy. All F1 progeny were RrYy, exhibiting the round and yellow dominant traits.

Step-by-step explanation:

The student question pertains to a genetic cross involving pea plants. Given the observation that all F1 progeny from a cross between a plant with wrinkled, yellow seeds and a plant with round, green seeds resulted in round, yellow seeds, we can determine the genotypes of the parental plants. In pea plants, round seed shape (R) is dominant to wrinkled seed shape (r) and yellow peas (Y) are dominant to green peas (y).

Since all F1 progeny exhibit the dominant phenotypes (round and yellow seeds), the parental plants must have had the genotypes rryy (wrinkled, yellow) and RRyy (round, green). The F1 progeny are thus RrYy, exhibiting the dominant traits.