epistasis

https://doi.org/10.1351/goldbook.10673
Situation in which the phenotypic expression of one gene obscures the phenotypic effects of another gene.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 750 (https://doi.org/10.1515/pac-2015-1202)