The term applied when one gene interferes with the expression of another is epistasis.

Here's a breakdown:

* Epistasis: A phenomenon where the expression of one gene (the epistatic gene) masks or modifies the expression of another gene (the hypostatic gene). This means the epistatic gene can determine the phenotype even if the hypostatic gene carries a different allele.

There are different types of epistasis, but the key takeaway is that one gene is influencing the expression of another, rather than acting independently.