gene
A theoretical unit of heredity of living organisms which may take several values and (in principle) predetermines a precise trait of an organism's form (phenotype), such as hair color.
Other meanings
A segment of DNA or RNA from a cell's or an organism's genome, that may take several forms and thus parameterizes a phenomenon, such as (often) the structure of a protein.
“A change in a gene is reflected in the protein or RNA molecule that it codes for.”
Example sentences
Word history
From Ancient Greek "γενεά" (generation, descent).
Where this comes from
This definition is adapted from “gene” on Wiktionary, by its contributors; example sentences are from Tatoeba, credited to their authors above, published under CC BY-SA 4.0. This page is published under the same licence.