The Punnett square is a shorthand method of predicting the genotypic and phenotypic ratios of progeny from a genetic cross.
-If an F₁ plant depicted in Figure above is backcrossed to the parent with round seeds, what proportion of the progeny will have wrinkled seeds? (Use a Punnett square.)

Question

The Punnett square is a shorthand method of predicting the genotypic and phenotypic ratios of progeny from a genetic cross. -If an F<sub>1</sub> plant depicted in Figure above is backcrossed to the parent with round seeds, what proportion of the progeny will have wrinkled seeds? (Use a Punnett square.) A) 3/4 B) 1/2 C) 1/4 D) 0

Quizplus · Accepted Answer

When an F1 plant (heterozygous for seed shape, Rr) is backcrossed to the parent with round seeds (homozygous dominant, RR), all progeny will have at least one dominant allele (R) and thus will have round seeds. Therefore, the proportion of progeny with wrinkled seeds (rr) is 0.

The Punnett Square Is a Shorthand Method of Predicting the Genotypic