Online Dictionary

homology Explained

homology at English => English (The Britannica Concise) Of Explained:

Similarity of the structure, physiology, or development of different species of organisms based on their descent from a common evolutionary ancestor. Analogy, by contrast, is a functional similarity of structure that is based not on common evolutionary origins but on mere similarity of use. The forelimbs of such widely differing mammals as humans, bats, and deer are homologous; the form of construction and the number of bones in each are practically identical and represent adaptive modifications of the forelimb structure of their shared ancestor. The wings of birds and insects, on the other hand, are merely analogous; they are used for flight in both types of organisms but do not share a common ancestral origin.

homology at English => English (Moby Thesaurus II) Of Explained:

42 Moby Thesaurus words for "homology":
accord, addition, adjunct, affairs, affiliation, affinity,
alliance, approximation, assemblage, association, bond, closeness,
combination, connectedness, connection, contiguity, contrariety,
dealings, deduction, disjunction, filiation, intercourse, intimacy,
junction, liaison, link, linkage, linking, mutual attraction,
nearness, propinquity, proximity, rapport, relatedness, relation,
relations, relationship, similarity, sympathy, tie, tie-in,
union

homology at English => English (English Thesaurus) Of Explained:

[N] (Relation): relation, bearing, reference, connection, concern, correlation, analogy, similarity, affinity, homology, alliance, homogeneity, association, approximation, nearness, filiation, cognation, consanguinity, interest, relevancy, dependency, relationship, relative position, comparison, ratio, proportion, link, tie, bond.

[N] (Uniformity): uniformity, homogeneity, homogeneousness, consistency, homology, accordance, conformity, identity, agreement, consonance, uniformness, regularity, constancy, routine, monotony.

Homology at English => English (Websters 1913) Of Explained:

Homology \Ho*mol"o*gy\, n. [Gr. ? agreement. See {Homologous}.]
1. The quality of being homologous; correspondence; relation;
as, the homologyof similar polygons.

2. (Biol.) Correspondence or relation in type of structure in
contradistinction to similarity of function; as, the
relation in structure between the leg and arm of a man; or
that between the arm of a man, the fore leg of a horse,
the wing of a bird, and the fin of a fish, all these
organs being modifications of one type of structure.

Note: Homology indicates genetic relationship, and according
to Haeckel special homology should be defined in terms
of identity of embryonic origin. See {Homotypy}, and
{Homogeny}.

3. (Chem.) The correspondence or resemblance of substances
belonging to the same type or series; a similarity of
composition varying by a small, regular difference, and
usually attended by a regular variation in physical
properties; as, there is an homology between methane,
{CH4}, ethane, {C2H6}, propane, {C3H8}, etc., all members
of the paraffin series. In an extended sense, the term is
applied to the relation between chemical elements of the
same group; as, chlorine, bromine, and iodine are said to
be in homology with each other. Cf. {Heterology}.

{General homology} (Biol.), the higher relation which a
series of parts, or a single part, bears to the
fundamental or general type on which the group is
constituted. --Owen.

{Serial homology} (Biol.), representative or repetitive
relation in the segments of the same organism, -- as in
the lobster, where the parts follow each other in a
straight line or series. --Owen. See {Homotypy}.

{Special homology} (Biol.), the correspondence of a part or
organ with those of a different animal, as determined by
relative position and connection. --Owen.

homology at English => English (WordNet) Of Explained:

homology
n : the quality of being similar or corresponding in position or
value or structure or function

homology at English (WD) Of Explained:

Inter: wikipedi » a

English

Noun

Inter: en-noun » homolog|ies
  • A homologous relationship.
    1. Inter: biolog » y A correspondence of structures in two life forms with a common evolutionary origin, such as flippers and hands.
    2. Inter: chemistr » y The relationship between the elements in the same group of the periodic table, or between organic compounds in a homologous series.
    3. Inter: mathematic » s A theory associating a system of quotient groups to each topological space.
    4. Inter: mathematic » s A system of quotient groups associated to a topological space.
    5. Inter: genetic » s The presence of the same series of bases in related genes.

      Usage notes

      * Inter: en-usage-h-a » n

  • Inter: sense » biology For a discussion of the use of the term Inter: term » |homology (and by association Inter: term » 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 )
  • Inter: sense » mathematics When used attributively before the name of a topological space, as in "homology {{n}}-sphere" or "homology manifold", the reference is to a space whose homology is the same as that of the space mentioned: an homology manifold, for example, is a space whose homology is that of some manifold.

    Derived terms

    * cohomology
  • microhomology

    Related terms

    * analogy
  • homologue

    Translations

    Inter: trans-top » homologous relationship
  • Finnish: Inter: t- » fi|samankaltaisuus, Inter: t+ » fi|homologia

  • Inter: trans-mi » d
    Inter: trans-botto » m
    Inter: trans-top » biology: correspondence of structures in two life forms with a common evolutionary origin
    • Finnish: Inter: t+ » fi|homologia


    Inter: trans-mi » d
    Inter: trans-botto » m
    Inter: trans-top » chemistry: relationship between the elements in the same group of the periodic table
    • Finnish: Inter: t+ » fi|homologia


    Inter: trans-mi » d
    Inter: trans-botto » m
    Inter: trans-top » mathematics: theory associating a system of quotient groups to each topological space
    • Finnish: Inter: t+ » fi|homologia


    Inter: trans-mi » d
    Inter: trans-botto » m
    Inter: trans-top » mathematics: system of quotient groups associated to a topological space
    • Finnish: Inter: t+ » fi|homologia


    Inter: trans-mi » d
    Inter: trans-botto » m
    Inter: trans-top » genetics: presence of the same series of bases in related genes
    • Finnish: Inter: t+ » fi|homologia


    Inter: trans-mi » d
    Inter: trans-botto » m
    Inter: checktrans-to » p
    • Inter: ttbc » cs: Inter: t- » cs|homologie|f
    • Inter: ttbc » fr: Inter: t+ » fr|homologie
    • Inter: ttbc » de: Homologie


    Inter: trans-mi » d
  • Inter: ttbc » ga: homalógacht {{f}}
  • Inter: ttbc » ro: omologie {{f}}
  • Inter: ttbc » sl: homologija

  • Inter: trans-botto » m
    Category: Category:English nouns ending in "-ology" -
    Category: Category:English words suffixed with -ology -
    Translation: et » homology
    Translation: fa » homology
    Translation: io » homology
    Translation: id » homology
    Translation: hu » homology
    Translation: pl » homology
    Translation: ta » homology
    Translation: vi » homology
    Translation: zh » homology