recessive gene

https://doi.org/10.1351/goldbook.16026
Allele which in the heterozygous state is expected to have no effect on the phenotype of the organism which carries it.
Source:
PAC, 2007, 79, 1153. (Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)) on page 1295 [Terms] [Paper]