In genetics, relating to or denoting heritable characteristics controlled by genes which are expressed in offspring only when inherited from both parents.
Compare: dominant
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 799 (https://doi.org/10.1515/pac-2015-1202)