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
25%
100%
50%
75%

Answer 1

The Punnett square for a cross between an Ss plant and an Ss plant would look like this:

S s
S SS Ss
s Ss ss

From the Punnett square, it can be observed that there are 4 possible offspring genotypes: SS, Ss, Ss, and ss. Out of these genotypes, 3 have the dominant allele S, which results in smooth pods (SS, Ss, Ss). Therefore, the percent of offspring that are likely to have smooth pods is 75%.