In summer squash fruit color exhibits epistatsis. There are two genes that affec

Question

In summer squash fruit color exhibits epistatsis. There are two genes that affect the color, W and G, and each has two alleles one dominant and one recessive. White color is caused by the dominant W allele. This allele is epistatic to G; that is, any squash with a W allele is white, regardless of the genotype for G. If and only if the fruit is homozygous ww, then G_ produces a green fruit and gg produces a yellow one. Assume you have a white squash of genotype (WwGg) which you mated with green squash of genotype (wwGg). Fill out the Punnet square below and then predict the phenotypic ratio in the offspring.

4x4 Punnet Square

Explanation / Answer

Gametes of white WwGg will be WG, Wg, wG, wg.

Gametes of green wwGg will be wG and wg.

To produce a 4 X 4 punnett square =

WwGG

(white)

WwGg

(white)

wwGG

(green)

wwGg

(green)

WwGg

(white)

Wwgg

(white)

wwGg

(green)

wwgg

(yellow)

WwGG

(white)

WwGg

(white)

wwGG

(green)

wwGg

(green)

WwGg

(white)

Wwgg

(white)

wwGg

(green)

wwgg

(yellow)

so, phenotypic ratio is 8 white: 6 green:2 yellow

WG Wg wG wg wG

WwGG

(white)

WwGg

(white)

wwGG

(green)

wwGg

(green)

wg

WwGg

(white)

Wwgg

(white)

wwGg

(green)

wwgg

(yellow)

wG

WwGG

(white)

WwGg

(white)

wwGG

(green)

wwGg

(green)

wg

WwGg

(white)

Wwgg

(white)

wwGg

(green)

wwgg

(yellow)

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