Question

Which of the following is an example of dominant epistasis?

a)Seed shape and seed color in peas
b)Coat color in Labrador retrievers
c)Color in squash
d)Albinism in snails
e)None of the above

Answer 1

In summer squash, the fruit color is controlled by two genes. The dominant allele at one gene masks the expression of the other gene, resulting in yellow fruit. However, if the second gene is homozygous recessive, the fruit will be white. This is an example of dominant epistasis. The correct option is e)None of the above

Step-by-step explanation:

An example of dominant epistasis can be observed in the fruit color of summer squash. Fruit color is determined by two genes, with the dominant allele at one gene masking the expression of the other.

The dominant allele at the first gene results in yellow fruit, while the recessive allele allows the expression of the second gene. If the second gene is homozygous recessive, the fruit will be white regardless of the allele at the first gene.

This relationship of gene interaction is called epistasis, and when the dominant allele at one gene masks the expression of another gene, it is referred to as dominant epistasis. The correct option is e)None of the above