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2025-02-18T04:35:17Z

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			<gallery>
			File:Human_karyotype_with_bands_and_sub-bands.png\|Human karyotype with bands and sub-bands
			File:HR_in_meiosis.svg\|Homologous recombination in meiosis
			File:MajorEventsInMeiosis.svg\|Major events in meiosis
			File:Nondisjunction_Diagrams.svg\|Nondisjunction diagrams
			File:HR_schematic_diagram.svg\|Homologous recombination schematic diagram
			</gallery>

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2024-02-23T18:49:38Z

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'''Homologous Chromosomes''' are a pair of chromosomes, one from each parent, that have the same length, gene position, and centromere location. They are key players in the process of [[meiosis]], where they pair up and exchange segments of DNA in a process known as [[crossing over]].

== Definition ==
Homologous chromosomes, also known as ''homologs'', are two pieces of DNA within a diploid organism which carry the same genes, one from each parental source. They are similar but not identical, each carrying a different version of the same genes. These different versions of the same gene are called [[alleles]].

== Role in Meiosis ==
During [[meiosis]], homologous chromosomes pair up in a process called [[synapsis]]. This pairing allows for the exchange of genetic material between homologous chromosomes, a process known as [[crossing over]]. This genetic recombination results in offspring that are genetically different from their parents, contributing to genetic diversity.

== Role in Mitosis ==
In [[mitosis]], homologous chromosomes do not pair up. Instead, each chromosome is replicated and the two copies, called [[sister chromatids]], are distributed to the two daughter cells. This ensures that each daughter cell receives a complete set of chromosomes.

== Disorders Involving Homologous Chromosomes ==
Errors in the separation of homologous chromosomes during meiosis can lead to disorders such as [[Down syndrome]], where an individual has three copies of chromosome 21 instead of the usual two. Other disorders caused by such errors include [[Klinefelter syndrome]], [[Turner syndrome]], and [[Patau syndrome]].

== See Also ==
* [[Chromosome]]
* [[Gene]]
* [[Allele]]
* [[Meiosis]]
* [[Mitosis]]
* [[Crossing over]]
* [[Synapsis]]
* [[Sister chromatids]]
* [[Down syndrome]]
* [[Klinefelter syndrome]]
* [[Turner syndrome]]
* [[Patau syndrome]]

[[Category:Genetics]]
[[Category:Cell biology]]
[[Category:Chromosomes]]

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Homologous chromosome - Revision history

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