Edit page | Page history | Printable version

Definition

noun

(evolutionary biology) Structures derived from a common ancestor or same evolutionary or developmental origin

Supplement

Homologous structures may not necessarily perform the same function but they share a common ancestral origin.

For instance, the forelimbs of humans and bats are homologous structures. Although they are used differently, the basic skeletal structure is the same and they are derived from the same embryonic origin. Their similarity in this regard could indicate a likely evolution from a common ancestor.

Compare:

• analogous structure

See also:

• divergent evolution

Related term(s):

• homologous
• homology