HOMOLOGOUS

homologous

(adjective) corresponding or similar in position or structure or function or characteristics; especially derived from an organism of the same species; “a homologous tissue graft”

homologous

(adjective) having the same evolutionary origin but not necessarily the same function; “the wing of a bat and the arm of a man are homologous”

Source: WordNet® 3.1

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Etymology

Adjective

homologous (comparative more homologous, superlative most homologous)

Showing a degree of correspondence or similarity.

(biology) Corresponding to a similar structure in another life form with a common evolutionary origin.

(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

Source: Wiktionary

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Ho*mol"o*gous, a. Etym: [Gr.

Definition: Having the same relative position, proportion, value, or structure. Especially: (a) (Geom.) Corresponding in relative position and proportion. In similar polygons, the corresponding sides, angles, diagonals, etc., are homologous. Davies & Peck (Math. Dict. ). (b) (Alg.)

Definition: Having the same relative proportion or value, as the two antecedents or the two consequents of a proportion. (c) (Chem.) Characterized by homology; belonging to the same type or series; corresponding in composition and properties. See Homology,

3. (d) (Biol.) Being of the same typical structure; having like relations to a fundamental type to structure; as, those bones in the hand of man and the fore foot of a horse are homologous that correspond in their structural relations, that is, in thier relations to the type structure of the fore limb in vertebrates. Homologous stimulus. (Physiol.) See under Stimulus.

Source: Webster’s Unabridged Dictionary 1913 Edition

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