Question

two plants are heterozygous for seed shape and have round seeds. if the two plants are crossed, what is the probability that the offspring will have wrinkled seeds?
25 percent
50 percent
75 percent
100 percent

Explanation:

Step1: Determine allele symbols

Let R represent the dominant allele for round seeds and r represent the recessive allele for wrinkled seeds. Heterozygous plants have the genotype Rr.

Step2: Set up the Punnett - square cross

When two Rr plants are crossed, the possible gametes from each plant are R and r. The Punnett - square has 4 possible combinations: RR, Rr, Rr, and rr.

Step3: Calculate the probability

Out of the 4 possible genotypes in the Punnett - square, only 1 (rr) results in wrinkled seeds. So the probability of getting an offspring with wrinkled seeds is $\frac{1}{4}$ or 25%.

Answer:

A. 25 percent