What will be the probable phenotype ratio if a white summer squash (Wwyy) is crossed to a yellow summer squash (wwYy)?

2 white : 2 yellow

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2 white : 2 green

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1 white : 2 yellow : 1 green

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2 white : 1 yellow : 1 green

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Solution

The correct option is A 2 white : 2 yellow
In summer squash, white fruit color (W) is dominant over yellow fruit color. Also, the gene W is epistatic to the gene Y and y as it suppresses the synthesis of its pigment. The gametes from the white summer squash (Wwyy) will be Wy and wy and the genes from the yellow summer squash (wwYy) will be wY and wy. So, the cross between the two will result in the genotypes: WwYy, Wwyy, wwyY, and wwyy. The phenotypes will be WwYy and Wwyy will be white since the white gene is dominant and the gene W is epistatic. wwyY will be yellow and wwyy will be green.
So, the correct option is '2 white: 1 yellow: 1 green'.

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