Final answer:
Epistasis is a phenomenon in which one gene alters the expression of another gene. The epistatic gene masks or interferes with the expression of the hypostatic gene. Hence the correct answer is option A
Step-by-step explanation:
True. In epistasis, one gene, known as the epistatic gene, alters the expression of another gene, known as the hypostatic gene. The epistatic gene masks or interferes with the expression of the hypostatic gene, resulting in a change in the phenotype.
Hence the correct answer is option A