Dictionary » H » Homologous chromosome

Homologous chromosome


noun, plural: homologous chromosomes

(Science: genetics)

1. one of a pair of chromosomes

2. a chromosome with the same gene sequence as another


In a biological cell, a chromosome pairs with another chromosome during meiosis. This pairing (synapsis) happens between two chromosomes that are homologous, i.e. chromosomes having the same genes at the same loci but possibly different alleles. For example, two chromosomes may have genes encoding eye color, but one may code for brown eyes, the other for blue.

A human cell contains 23 pairs of homologous chromosomes: 22 of them are homologous non-sex chromosomes (or autosomes) and 1 homologous pair of sex chromosomes. In females, the homologous sex chromosomes are 2 X’s; in males the X and Y chromosomes.

Compare: sister chromatids.

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I have got some BIG issues! forgive the long post

... my School babes! BLOOD GROUP SYSTEMS ABO The ABO genes reside on the chromosome 9 (Bernstein’s theory). The blood groups A and B are further subdivided ... 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, ...

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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

Meiosis prophase I 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 ...

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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

... JackBean. Another one would be normal human + human with extra Y chromosome... Anyway, all I was trying to say is that because of the ethical ... two copies are required. This leads to the requirement for the homologous gene from the second parent. In theory, if neither parent organism ...

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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

Regarding pairing of chromosome in karyogram.

Hi. I've tried to match the homologous pairs, but i've stumbled upon a problem. I know it's a trisomy, but the number 15 doesn't match any of the other chromosomes. Can you please help?

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by ebmar
Fri Dec 06, 2013 11:09 pm
Forum: Molecular Biology
Topic: Regarding pairing of chromosome in karyogram.
Replies: 3
Views: 2587

Re: Year 11 Meiosis helpp!!!

... part of meiosis (prophase 1) there can be recombination (crossover) of homologous chromosomes. This would show up on your diagram as being a little bit of red on one arm of ...

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by ChrisHoStuart
Wed Oct 16, 2013 9:36 am
Forum: Human Biology
Topic: Year 11 Meiosis helpp!!!
Replies: 3
Views: 4463
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