Question

Fruit colour in Squash is an example of
A. Recessive epistasis
B. Dominant epistasis
C. Complementary genes
D. Inhibitory genes

Answer 1

Hint:- Squashes are the kind of fruits that are generally confused to be kept in which of the category either fruits or vegetables. They can be found in green, yellow or orangish colour. Some of the examples of squashes for better understanding are guard, pumpkins, zucchini etc.

Complete Answer:- Squash has been found an important crop for Andes mountains. Squashes develop from seeds and are produced from flowering plants hence we can say that is botanically fruit. Now if we keenly observe the above question first we need to understand the word “Epistasis' ' which means the interaction between the genes that are responsible for ‘phenotype’. Genes have two ways they can either mask on each other which results in a dominant trait or also they can combine to form a new trait. We can see that in summer squash ,the fruit colour can be white, green or even yellow. White genes are produced by a domain epistatic allele which we call ‘W’ whereas on other locus ‘Y’ for yellow fruit is dominance to its allele ‘y’ on green colour fruit. In this way dominant ‘W’ hides the colour and its colour of green and yellow.

This hybrid ratio results in 12 white, 3 yellow and 1 green so the final ratio becomes 12:3:1 which results in suppression of non-allelic genes. By this we can easily conclude that the correct answer is option is (B).

Note:- Locus is the location of genes on a chromosome whereas allele stands for a pair of genes that are present at a locus that control the characteristic. The concept of epistasis originally originated in genetics in 1907 and the word was first used by William Bateson and his collaborations.