The phrase "in genes" refers to something that is inherited or inherent in someone's genetic makeup. Some synonyms for this phrase include "genetically determined," "innate," "inherent," "inborn," "inherited," and "hereditary." These words are often used to describe traits or characteristics that are passed down through generations and are present from birth. For example, someone's eye color or height may be in their genes. It is important to note that while genes can play a significant role in determining certain traits, environmental factors can also influence these characteristics.