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Fruit color in squash is an eg of dominant episatasis. What doe this mean

Fruit color in squash is an eg of dominant episatasis. What doe this mean

Grade:12

1 Answers

Aabid Hussain
askIITians Faculty 576 Points
7 years ago
Hi Nihala,
Thank you for asking

As we know that this is the case of dominant epistasis. So, the ratio will be 12:3:1 rather than the normal 9:3:3:1.

An example of dominant epistasis may be seen in the fruit color of summer squash, which has three common fruit colors: white, yellow, and green. In crosses of white and yellow and of white and green, white is always expressed.
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In crosses of yellow and green, yellow is expressed. Yellow thus is recessive to white, but dominant to green.
Consider two genes, each with a pair of alleles: W/w and Y/y. In squashes that are W/– in genotype, the fruit is white no matter what genotype is at the other locus. In
w/w plants, the fruit is yellow if a dominant allele of the other locus is present, but green if it is absent. In other words, W/– Y/– and W/– y/y plants have white fruits, w/w Y/– plants have yellow fruits, and w/w y/y plants have green fruits. The F2 progeny of an F1 self of doubly heterozygous individuals shows a ratio of 12 white : 3 yellow : 1 green fruits in the plants.

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