Suppose you cross a pea plant with yellow, smooth seeds with one that has wrinkled, green seeds. You examine the seeds of 967 offspring and find that some have yellow, smooth seeds and some have yellow, wrinkled seeds, but no green seeds of either type show up. What is the genotype of the yellow-seeded parent? (Y = yellow, y = green; S = smooth, s = wrinkled)

Question

Quizplus · Accepted Answer

The yellow-seeded parent must have at least one dominant Y allele for yellow seeds. Since no green seeds were produced, the parent must also be homozygous for the dominant S allele for smooth seeds. Therefore, the genotype of the yellow-seeded parent is YYSs.

Suppose You Cross a Pea Plant with Yellow, Smooth Seeds