In summer squash, green fruit (G) is dominant over yellow (g) and bumpy fruit (B

Question

In summer squash, green fruit (G) is dominant over yellow (g) and bumpy fruit (B) is dominant over smooth shaped fruit (b). These two genes are located on different autosomes. In the following crosses, the phenotypes of the parents and offspring are given. For each independent cross, list the genotypes of the parents using symbols defined above.

A. P1: green, bumpy x yellow, smooth

F1 : 1/2 green, bumpy and 1/2 green, smooth

B. P1: green, smooth x green, smooth

F1: 3/4 green, smooth and 1/4 yellow smooth

C

P1: green, bumpy x yellow, smooth

F1: 1/4 green, bumpy, 1/4 green, smooth, 1/4 yellow bumpy, 1/4 yellow smooth

D

P1: green, bumpy x green, smooth

F1: 3/8 green, bumpy, 3/8 green smooth, 1/8 yellow bumpy, 1/8 yellow smooth

Explanation / Answer

A. P1: green, bumpy (GB) x yellow, smooth (gb)

F1 : 1/2 green, bumpy (GB) and 1/2 green, smooth (Gb)

B. P1: green, smooth (Gb) x green, smooth (Gb)

F1: 3/4 green, smooth (Gb) and 1/4 yellow smooth (gb)

C. P1: green, bumpy (GB) x yellow, smooth (gb)

F1: 1/4 green, bumpy (GB), 1/4 green, smooth (Gb), 1/4 yellow bumpy (gB), 1/4 yellow smooth (gb)

D. P1: green, bumpy (GB) x green, smooth (Gb)

F1: 3/8 green, bumpy (GB), 3/8 green smooth (Gb), 1/8 yellow bumpy (gB), 1/8 yellow smooth (gb)

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