Question: Summer squash exist in long, spherical, or disk shapes. When a true-breeding long-shaped strain was crossed to a true-breeding disk-shaped strain, all of the F1

Summer squash exist in long, spherical, or disk shapes. When a true-breeding long-shaped strain was crossed to a true-breeding disk-shaped strain, all of the F1 offspring were disk-shaped. When the F1 offspring were allowed to self-fertilize, the F2 generation consisted of a ratio of 9 disk-shaped to 6 round-shaped to 1 longshaped.

Assuming that the shape of summer squash is governed by two different genes, with each gene existing in two alleles, propose a mechanism to account for this 9:6:1 ratio.

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The observed 961 ratio in the F2 generation of the summer squash cross suggests that two different genes each existing in two alleles contribute to th... View full answer

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