In summer squash, spherical-shaped fruit has been shown to be dominant to elongated fruit. On one

occasion, two different spherical varieties were crossed and produced all disk-shaped fruits. When
these hybrid disk-shaped fruits were crossed, they produced 75 disk-shaped fruits, 48 spherical fruits,
and 9 elongated fruits. Explain. What will be an ideal response?


9 D_ S_ disk, 3 D_ ss spherical, 3 dd S_ spherical, 1 dd ss elongated; presence of both dominant genes
produces disk, while the presence of either one of the genes as homozygous recessive produces
spherical, and both recessive produces elongated fruit

Biology & Microbiology

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