The Epistasis reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Epistasis

Epistasis is the masking of the phenotypic effects of one gene by alleles of another at another locus. A gene is epistatic when its presence suppresses the effect of the other gene. Epistatic genes are also known as inhibiting genes due to their effects on other genes which are described as hypostatic.

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