Final answer:
A gene that is suppressed by the effect of another gene at a different locus is called an epistatic gene, which masks the expression of the hypostatic gene.
Step-by-step explanation:
A gene that is suppressed by the effect of another gene at a different locus is known as a(n) epistatic gene. The term epistasis comes from Greek roots meaning "standing upon." An epistatic gene masks or interferes with the expression of another gene, termed the hypostatic gene. This often occurs in biochemical pathways where the expression of one gene depends on the function of another gene within the pathway. For example, in mice coat pigmentation, a gene responsible for color may be masked by another gene that controls the production of pigment, resulting in an albino mouse regardless of the other gene's alleles.