Question

in gregor mendels systematic studies of inheritance, he crossed round peas with wrinkled peas. the offspring were all round peas. then these round peas were crossed with each other. what was the result? a. 25% round peas and 75% wrinkled peas all round peas 50% round peas and 50% wrinkled peas 75% round peas and 25% wrinkled peas

Explanation:

Step1: Determine dominant - recessive trait

Since the offspring of round and wrinkled peas are all round, round is the dominant trait (R) and wrinkled is the recessive trait (r). The first - generation offspring are all heterozygous (Rr).

Step2: Set up Punnett - square cross

When Rr is crossed with Rr, the possible gametes are R and r from each parent. The Punnett - square has the following combinations: RR, Rr, Rr, rr.

Step3: Calculate ratios

RR and Rr result in round peas. There are 3 combinations that result in round peas (1 RR + 2 Rr) out of 4 total combinations, which is 75%. rr results in wrinkled peas, which is 1 out of 4 combinations, or 25%.

Answer:

D. 75% round peas and 25% wrinkled peas