Epistasis is a type of gene interaction showing

control of a phenotype by three genes

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masking of the effect of a gene by a non-allelic locus

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producing a new character when two nonallelic genes happen together in an individual

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enhancing the effect of a gene by a non-allelic gene

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Solution

The correct option is B masking of the effect of a gene by a non-allelic locus
If one allele or allelic pair masks the expression of an allele at the second gene, that allele or allelic pair is epistatic to the second gene

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Column I	Column II
Pleiotropic gene	Both allele express equally
Codominance	Change in nucleotide
Epistasis	One gene shows multiple phenotypic expression
Mutation	Non - allelic gene inheritance

	I		II
A	Dominance	i	In a heterozygous organism both alleles express themselves fully
B	Epistasis	ii	A single gene influences many characters
C	Pleiotropy	iii	One gene is suppressed by other gene.
D	Codominance	iv	One allele masks the other allele of the same gene