If the progeny of a mating of pea plants have the following ratios 1342 smooth seed/green pod, 447 wrinkled seed/yellow pod, 429 smooth seed/ yellow pod, 1361 wrinkled seed/green pod what are the genotypes of the parents?
A) Parent 1: Homozygous for seed shape and pod color Parent 2: Heterozygous for seed shape and homozygous for pod color
B) Both parents are heterozygous for seed shape and pod color
C) Parent 1: Heterozygous for seed shape and pod color Parent 2: Homozygous seed shape and heterozygous for pod color
D) Parent 1: Heterozygous for both seed shape and pod color Parent 2: Homozygous for both seed shape and pod color

Question

Quizplus · Accepted Answer

To determine the genotypes of the parents, we can use the ratios given in the progeny.

From the ratio of 1342 smooth seed/green pod, we know that one parent must be homozygous for smooth seed and green pod (SSGG).

From the ratio of 447 wrinkled seed/yellow pod, we know that the other parent must be homozygous for wrinkled seed and yellow pod (ssYY).

From the ratio of 429 smooth seed/yellow pod, we know that the second parent must also carry at least one dominant allele for smooth seed (S). This means the second parent must be heterozygous for seed shape (SsYY).

From the ratio of 1361 wrinkled seed/green pod, we know that the first parent must also carry at least one recessive allele for seed shape (s). This means the first parent must be heterozygous for seed shape (SsGG).

Therefore, the best choice is C, as it satisfies all the ratios given in the progeny.

If the Progeny of a Mating of Pea Plants Have