The 9:6:1 F2 ratio found in fruit shape in summer squash is a deviation from an expected Mendelian ratio. What does this represent?

Question

What will be an ideal response?

Answer 1

Two genes are involved in the production of squash shape. A dominant allele of either gene and homozygous recessivity for the other results in a spherical fruit. Homozygous recessivity in both genes results in long-shaped fruit. Two dominant alleles interact to give a disk-shaped fruit.