What does epistasis refer to in genetics?

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A gene pair intensifies the phenotypic effect of a different gene pairMultiple genes collectively influence a specific traitOne gene pair entirely conceals the expression of another gene pairA single gene pair governs a trait independently

Explanation

Epistasis occurs when one gene pair completely masks the expression of another gene pair, thereby altering the expected phenotypic ratios. This is different from gene interaction where one gene enhances another or multiple genes control a trait together.