A significantly similar DNA, RNA or protein sequence that stems from a common ancestor. See also ortholog and paralog.

A shared feature that defines a clade. In an evolutionary context, homologues are features that are similar because they are inherited from a common ancestor.

a protein that has a certain fraction of its coded amino acids the same as another protein

That which is homologous to something else; as, the corresponding sides, etc., of similar polygons are the homologues of each other; the members or terms of an homologous series in chemistry are the homologues of each other; one of the bones in the hand of man is the homologue of that in the paddle of a whale.

See homologous chromosome.

One of a pair of chromosomes having corresponding loci.

Body parts that are the same in different animals, although they may have a different morphology because they have been modified with descent as adaptations.

homolog