Question

suppose you have the monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in the ration 3:1. If the allele are designated (R & r) respectively, what is the probably genotypes of the rounds seeds with were produced?

Answer 1

Answer;

The correct answer would be Rr.

In a monohybrid cross, the phenotype ratio of 3:1 is obtained only when both the parents are heterozygous for the trait.

In this condition, the heterozygous genotype would be Rr. The phenotype of both the parents would be round seeds (R) as the round is a dominant trait.

The cross of these parents would produce offspring with three types of genotypes RR, Rr, and rr in ratio 1:2:1.

Thus, the phenotypic ratio would come out to be 3 (round seed):1 (wrinkled seed).