Homologous chromosome

Definition

noun, plural: homologous chromosomes

(Science: genetics)

1. one of a pair of chromosomes

2. a chromosome with the same gene sequence as another


Supplement

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.


Please contribute to this project, if you have more information about this term feel free to edit this page



This page was last modified on 16 June 2008, at 12:20. This page has been accessed 458,559 times. 
What links here | Related changes | Permanent link