A cross between two squash plants that produce yellow squash results in 124 offspring: 93 produce yellow squash and 31 produce green squash. What are the likely genotypes of the plants that were crossed?

Question

A cross between two squash plants that produce yellow squash results in 124 offspring: 93 produce yellow squash and 31 produce green squash. What are the likely genotypes of the plants that were crossed?

A.
both YY
B.
both Yy
C.
both yy
D.
one YY, one Yy

Answer 1

The correct answer is D.

In order for some offspring to produce yellow squash and others to produce green squash, one parent must have the genotype YY (producing yellow squash) and the other parent must have the genotype Yy (which can produce either yellow or green squash).