Summer squash exist in long, spherical, or disk shapes. When atrue-breeding long-shaped strain was crossed to a true-breedingdisk-shaped strain, all of the F1 offspring were disk-shaped. Whenthe F1 offspring were allowed to self-fertilize, the F2 generationconsisted of a ratio of 9 disk-shaped to 6 round-shaped to 1 longshaped. Assuming the shape of summer squash is governed by twodifferent genes, with each gene existing in two alleles, propose amechanism to account for this 9:6:1 ratio

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 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 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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