different between homologous vs allogenic

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

allo- +? -genic

Pronunciation

IPA^(key): /?æl??d???n?k/

Adjective

allogenic (comparative more allogenic, superlative most allogenic)

1. Having an external cause, or source; exogenous.
2. (geology) Formed in another location and transported.
3. (medicine, biology, genetics, immunology) Alternative form of allogeneic: genetically distinct, but of the same species; nonself but intraspecies.

Translations

Usage notes

Do not confuse allogenic ("of nonself intraspecies origin") with allergenic ("generating allergy"); the two concepts are often related (because allergic reactions can potentially be caused by any antigen and usually/especially by nonself antigens), but the similar sound of the two words is due only to partial cognation of the word roots.

Anagrams

• collegian