different between homologous vs orthologous

English

Pronunciation

• IPA^(key): /h??m?l???s/

Etymology

From Latinized form of Greek homologos "agreeing, of one mind" from homos "same" + logos "relation, reasoning"

From 1655, in the mathematical sense. See also homolog, homologue. (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

Adjective

homologous (comparative more homologous, superlative most homologous)

1. Showing a degree of correspondence or similarity.
   1. (mathematics) In corresponding proportion.
   2. (biology) Corresponding to a similar structure in another life form with a common evolutionary origin.
   3. (chemistry) Belonging to a series of aliphatic organic compounds that differ only by the addition of a CH? group.
   4. (genetics) Having the same morphology as another chromosome; relating to a homologue.

Usage notes

• (biology) For a discussion of the use of the term "homology" (and by association "homologous") in biology, see: Patterson, Colin. "Homology in Classical and Molecular Biology." Molecular Biology and Evolution 5, no. 6 (November 1988): 603–625. http://mbe.oxfordjournals.org/cgi/reprint/5/6/603.pdf (accessed 18 December 2009; archived 18 December 2009, http://www.webcitation.org/5m7rn4rCe )

Antonyms

• heterologous

Derived terms

Related terms

• autologous
• homolog, homologue
• homologize
• homology

Translations

References

English

Etymology

orthology +? -ous

Adjective

orthologous (not comparable)

1. (genetics, of genes or sequences) exhibiting orthology; having been separated by a speciation event. Usually while retaining the same function.

Related terms

• ortholog
• homologous
• orthologization
• paralogous
• xenologous

Translations