Question

The phenomenon in which an allele of one gene supresses the activity of an allele of another gene is known as

• A. Epistasis
• B. Dominance
• C. Inactivation
• D. Suppression

Answer 1

The Correct Option is A

The given question asks about the phenomenon in which an allele of one gene suppresses the activity of an allele of another gene. The correct answer to this question is "Epistasis."

Let's break down the concepts involved:

1. Epistasis is a genetic phenomenon where the effect of one gene (locus) is dependent on the presence of one or more 'modifier genes' (that is, genes other than the allele involved). In other words, the alleles of one gene can mask or suppress the expression of alleles of another gene. This interaction often affects traits such as color in animals and plants.
2. Dominance refers to the relationship between alleles of a single gene, where one allele masks the expression of another allele at the same locus within a paired set of chromosomes. It is important to note that dominance deals with alleles of the same gene, not between different genes.
3. Inactivation is the process by which a gene is turned off, so it no longer expresses itself. This process is distinct from epistasis, as it typically involves a single gene rather than an interaction between two genes.
4. Suppression in genetic terms can refer to any kind of reduction in gene expression, but it is typically not used in the context of one gene acting over another; rather, it's more akin to inactivation.

Considering these definitions, the appropriate choice is "Epistasis," which correctly describes an allele of one gene suppressing the allele of another gene.