Answer :
the expression of an allele of a gene completely masks the expression of another gene is known as Epistasis
In genetics, epistasis occurs when two or more distinct gene loci do not additively contribute to the same phenotype. A common definition of epistasis is when one gene locus alters or masks the phenotype of another. The relationship between genes in epistasis is referred to as epistatic. Although this is the most common instance, epistasis can take place in situations other than a step-by-step progression. Another way to look at this is as if a pigment (P) controls a product, like the color of an animal's coat. The processes necessary to produce P from a precursor molecule are aided by a variety of genes. All of these steps need to work properly to get to P. The phenotype, or in this case, the production of pigment from coat color, is affected if one of these genes has a mutation that prevents the reaction from occurring.
Epistasis is a phenomenon in which one gene's effect depends on the presence of one or more "modifier genes" (genetic background).In a similar vein, the effects of epistatic mutations when combined differ from those of their own. It originated in genetics but is now utilized in population genetics, computational biology, evolutionary biology, and biochemistry. Non-additive effects are the result of interactions between genes or within genes. Epistasis has a significant impact on the shape of evolutionary landscapes, which has significant repercussions for traits' potential for evolution.
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