different between homologous vs xenolog

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

Alternative forms

• xenologue

Noun

xenolog (plural xenologs)

1. (genetics) A type of ortholog where the homologous sequences are found in different species because of horizontal gene transfer.

Derived terms

• xenologous

Related terms

• ortholog

References

E.V. Koonin, K.S. Makarova, and L. Aravind. (2001) Horizontal Gene Transfer in Prokaryotes: Quantification and Classification. Annual Review of Microbiology 55: 709-742.