Dictionary > Homologous


Showing a degree of similarity (e.g. in position, structure, function or characteristics) that may indicate a common origin.
Having similar structure and anatomical position (but not necessarily the same function) in different organisms suggesting a common ancestry or evolutionary origin (e.g. wings of bats and arms of humans are homologous).
Pertaining to a series of organic compounds that differ by a constant increment, for instance by the addition of a CH2 group, as in homologous series, e.g. the alkanes: methane, ethane, propane, etc.
Pertaining to (a member of) a pair of chromosomes, as in homologous chromosomes.
Word origin: from Greek homologos = agreeing, correspondent.
Related forms: homology (noun).

Related terms: homologous chromosomes.
Compare: analogous, heterologous.

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