In pea plants, the allele for smooth pods (S) is dominant over the allele for pinched pods (s). Construct a Punnett square that shows a cross between an Ss plant and an Ss plant. Predict what percent of the offspring are likely to have smooth pods.

Question

In pea plants, the allele for smooth pods (S) is dominant over the allele for pinched pods (s). Construct a Punnett square that shows a cross between an Ss plant and an Ss plant. Predict what percent of the offspring are likely to have smooth pods.

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4 points
100%
75%
50%
25%

Answer 1

In pea plants, the allele for smooth pods (S) is dominant over the allele for pinched pods (s).

To construct a Punnett square for a cross between an Ss plant and an Ss plant, you would write the genotype of one parent along the top and the genotype of the other parent along the side.

S s
S SS Ss
s Ss ss

Each box in the Punnett square represents a possible genotype combination of the offspring.

In this case, there are four possible genotypes: SS, Ss, Ss, and ss.

Among these four possible genotypes, three of them have at least one dominant allele (S).

Therefore, 75% of the offspring are likely to have smooth pods.