Homology may refer to:

Sciences

Biology

Homology (biology) In biology, homology is similarity due to shared ancestry between a pair of structures or genes in different taxa. A common example of homologous structures is the forelimbs of vertebrates, where the wings of bats and birds, the arms of pri ...

, any characteristic of biological organisms that is derived from a common ancestor *

Sequence homology Sequence homology is the biological homology between DNA, RNA, or protein sequences, defined in terms of shared ancestry in the evolutionary history of life. Two segments of DNA can have shared ancestry because of three phenomena: either a spe ...

, biological homology between DNA, RNA, or protein sequences *

Homologous chromosome A couple of homologous chromosomes, or homologs, are a set of one maternal and one paternal chromosome that pair up with each other inside a cell during fertilization. Homologs have the same genes in the same loci where they provide points alon ...

s, chromosomes in a biological cell that pair up (synapse) during meiosis *

Homologous recombination Homologous recombination is a type of genetic recombination in which genetic information is exchanged between two similar or identical molecules of double-stranded or single-stranded nucleic acids (usually DNA as in cellular organisms but may ...

, genetic recombination in which nucleotide sequences are exchanged between molecules of DNA *

Homologous desensitization Homologous desensitization occurs when a receptor decreases its response to an agonist at high concentration. It is a process through which, after prolonged agonist exposure, the receptor is uncoupled from its signaling cascade and thus the cel ...

, a receptor decreases its response to a signalling molecule when that agonist is in high concentration *

Homology modeling Homology modeling, also known as comparative modeling of protein, refers to constructing an atomic-resolution model of the "''target''" protein from its amino acid sequence and an experimental three-dimensional structure of a related homologous pr ...

, a method of protein structure prediction

Chemistry

Homology (chemistry) In chemistry, homology is the appearance of homologues. A homologue (also spelled as homolog) is a compound belonging to a series of compounds differing from each other by a repeating unit, such as a methylene bridge −−, a peptide residue, et ...

, the relationship between compounds in a homologous series *

Homologous series In organic chemistry, a homologous series is a sequence of compounds with the same functional group and similar chemical properties in which the members of the series can be branched or unbranched, or differ by molecular formula of and molecu ...

, a series of organic compounds having different quantities of a repeated unit *

Homologous temperature Homologous temperature expresses the thermodynamic temperature of a material as a fraction of the thermodynamic temperature of its melting point (i.e. using the Kelvin scale): T_H = \frac For example, the homologous temperature of lead at room ...

, the temperature of a material as a fraction of its absolute melting point *

Homologation reaction In organic chemistry, a homologation reaction, also known as homologization, is any chemical reaction that converts the reactant into the next member of the homologous series. A homologous series is a group of compounds that differ by a constant ...

, a chemical reaction which produces the next logical member of a homologous series

Other sciences

* Homology (anthropology), analogy between human beliefs, practices or artifacts owing to genetic or historical connections *

Homology (psychology) Homology in psychology, as in biology, refers to a relationship between characteristics that reflects the characteristics' origins in either evolution or development. Homologous behaviors can theoretically be of at least two different varieties. A ...

, behavioral characteristics that have common origins in either evolution or development **

Homologous behaviors Homology in psychology, as in biology, refers to a relationship between characteristics that reflects the characteristics' origins in either evolution or development. Homologous behaviors can theoretically be of at least two different varieties. A ...

, behaviors typical of species that share a common ancestor that was characterized by that behavior OR behaviors in an individual that share common origins in development *

Homology (sociology) Homologies are "structural 'resonances'...between the different elements making up a socio-cultural whole." (Middleton 1990, p. 9) Examples include Alan Lomax's cantometrics, which: :Distinguishes ten musical styles, dealing most fully with E ...

, a structural resonance between the different elements making up a socio-cultural whole

Mathematics

Homology (mathematics) In mathematics, homology is a general way of associating a sequence of algebraic objects, such as abelian groups or modules, with other mathematical objects such as topological spaces. Homology groups were originally defined in algebraic topolog ...

, a procedure to associate a sequence of abelian groups or modules with a given mathematical object *

Homological algebra Homological algebra is the branch of mathematics that studies homology (mathematics), homology in a general algebraic setting. It is a relatively young discipline, whose origins can be traced to investigations in combinatorial topology (a precurs ...

, a branch of mathematics

Other uses

* Homologation, from the ancient Greek "to agree", to indicate the approval of a sanctioning body *

Homologation (motorsport) In motorsports, homologation is the type approval process through which a vehicle, a race track, or a standardised part is required to go for certification to race in a given league or series. The process of testing and certification for confor ...