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homology    
n. 相同,异体同形,同族关系

相同,异体同形,同族关系

homology
透射

homology
n 1: the quality of being similar or corresponding in position
or value or structure or function

Homology \Ho*mol"o*gy\, n. [Gr. ? agreement. See {Homologous}.]
1. The quality of being homologous; correspondence; relation;
as, the homologyof similar polygons.
[1913 Webster]

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.
[1913 Webster]

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}.
[1913 Webster]

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}.
[1913 Webster]

{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.
[1913 Webster]


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  • Homology (biology) - Wikipedia
    Homology among proteins or DNA is inferred from their sequence similarity Significant similarity is strong evidence that two sequences are related by divergent evolution from a common ancestor
  • Homology | Morphology, Comparative Anatomy Genetics | Britannica
    homology, in biology, similarity of the structure, physiology, or development of different species of organisms based upon their descent from a common evolutionary ancestor
  • Homologies - Understanding Evolution
    If different species share common ancestors, we would expect organisms to share similarities inherited from those ancestors Features inherited from common ancestors—even if their appearance is quite different in close relatives— are known as homologies Homologies can be identified by comparing the anatomies of different living things, looking at cellular similarities, studying
  • Homology - Definition and Examples - Biology Online Dictionary
    Biology definition: Homology is a condition characterized by having a degree of similarity, as in position or structure, that may indicate a common origin There is a correspondence of structure The term is a common or fundamental concept in evolutionary biology and genetics
  • What is homology in biology? - California Learning Resource Network
    Homology, a cornerstone concept in evolutionary biology, is the study of shared ancestry manifested in similar structures, sequences, or other traits across different taxa
  • homology - Wiktionary, the free dictionary
    homology (countable and uncountable, plural homologies) The relationship of being homologous; a homologous relationship (geometry, projective geometry) specifically, such relationship in the context of the geometry of perspective quotations 1863, George Salmon, A Treatise on Conic Sections, Longman, Brown, Green, Longman, and Roberts, 4th Edition, page 61, Two triangles are said to be
  • 7. 13C: Homologs, Orthologs, and Paralogs - Biology LibreTexts
    Homology describes the relationship between genes and how they are inherited from ancestors
  • Homology (mathematics) - Wikipedia
    Homology (mathematics) In mathematics, the term homology, originally introduced in algebraic topology, has three primary, closely related usages First, the most direct usage of the term is to take the homology of a chain complex, resulting in a sequence of abelian groups called homology groups
  • HOMOLOGY Definition Meaning | Dictionary. com
    Homology definition: the state of being homologous; homologous relation or correspondence See examples of HOMOLOGY used in a sentence





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