Fifty percent of the offspring produced by a cross between pea plants have seeds with a wrinkled (r) appearance caused by the presence of a homozygous recessive gene. what were the genotypes of the parents? a. rr × rr b. rr × rr c. rr × rr d. rr × rr

The correct option is B. Rr × rr

Explanation:

To illustrate the results, lets make a cross between RR and rr.

      r         r

R    Rr       Rr

r      rr        rr

The results from the following punnet square show that there will be a 50% probability that the offsprings will have heterozygous genotype Rr and they will be round.

The results from the punnet square show that there will be a 50% probability that the offsprings will be recessive and hence will have wrinkled seeds.

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