The phrase "in the genes" refers to something that is inherited or innate, usually pertaining to a certain characteristic or behavior. Synonyms for this phrase can include "genetically determined," "hereditary," "inherited," "innate," and "congenital." These terms all suggest that a trait or attribute is passed down from previous generations or exists naturally within an individual's genetic makeup. Additionally, words like "fixed," "hardwired," and "immutable" can also be used to describe characteristics that are unchangeable and deeply ingrained in one's genetic code. The phrase "inherited factor" can also be used to describe these genetic traits or tendencies.