Dictionary » H » Homologous





Showing a degree of similarity (e.g. in position, structure, function or characteristics) that may indicate a common origin.


Having similar structure and anatomical position (but not necessarily the same function) in different organisms suggesting a common ancestry or evolutionary origin (e.g. wings of bats and arms of humans are homologous).


Pertaining to a series of organic compounds that differ by a constant increment, for instance by the addition of a CH2 group, as in homologous series, e.g. the alkanes: methane, ethane, propane, etc.


Pertaining to (a member of) a pair of chromosomes, as in homologous chromosomes.


Word origin: from Greek homologos = agreeing, correspondent.

Related forms: homology (noun).
Related terms: homologous chromosomes.

Compare: analogous, heterologous.

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I have got some BIG issues! forgive the long post

... c, and e antigens. The main tenets of the theory are as follows: 1. Rh inheritance is controlled by 3 closely linked loci on each chromosome of a homologous pair. 2. Each locus has its own set of alleles which are Dd, Cc, and Ee. The D gene is dominant to the d gene, but Cc and Ee are co-dominant. ...

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by saddy51
Sun Jan 04, 2015 10:39 am
Forum: Genetics
Topic: I have got some BIG issues! forgive the long post
Replies: 1
Views: 1752


) A diploid cell contains three pairs of homologous chromosomes designated C1 and C2, M1 and M2, and S1 and S2. No crossing over occurs. a. What combination(s) of chromosomes are possible in daughter cells following mitosis? b. What combination(s) ...

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by lachatausa
Fri Mar 21, 2014 2:55 am
Forum: Genetics
Topic: genetic
Replies: 1
Views: 4164

Meiosis prophase I crossover

“Chromosomal crossover (or crossing over) is the exchange of genetic material between homologous chromosomes that results in recombinant chromosomes.” http://en.wikipedia.org/wiki/Chromosomal_crossover Question: Due to the multiple layers of winding, how can parts ...

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by gs99
Fri Mar 07, 2014 9:23 pm
Forum: Molecular Biology
Topic: Meiosis prophase I crossover
Replies: 0
Views: 4933

Human Gamete Compatibility Going Backwards

... full complement of genes. However, because some critical genes can be recessive, two copies are required. This leads to the requirement for the homologous gene from the second parent. In theory, if neither parent organism has any such genes, the organisms are "compatible". Once embryo ...

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by Cat
Sat Jan 11, 2014 7:56 pm
Forum: Evolution
Topic: Human Gamete Compatibility Going Backwards
Replies: 9
Views: 8752

Human Gamete Compatibility Going Backwards

on the other hand, although we may have the same number of chromosomes as antelopes, they will be hardly homologous so there will be no cell division

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by JackBean
Mon Jan 06, 2014 10:11 am
Forum: Evolution
Topic: Human Gamete Compatibility Going Backwards
Replies: 9
Views: 8752
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