IPA: /ˌɛpɪˈstætɪk/
KK: /ɛpɪˈstætɪk/
Relating to the interaction between genes, where one gene can mask or modify the expression of another gene.
The epistatic relationship between the two genes affected the color of the flowers.
Epistatic → It is formed from "epi-" (meaning upon or above) and "stasis" (from Greek "stasis", meaning standing or stability). The term refers to a gene that can affect the expression of another gene, thus standing above it in terms of genetic influence.
Think of a gene that stands 'upon' ('epi-') another gene, influencing its expression — that's what epistatic means.