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Sex chromosome

Definition

noun, plural: sex chromosomes

A type of chromosome in the genome that is involved in the determination of the sex as well as the development of sexual characteristics in an organism. It occurs in pairs in somatic cells while singly in sex cells (gametes).


Supplement

A somatic cell contains a genome comprised of paired chromosomes: the autosomes and sex chromosomes. In humans, there are two forms of sex chromosomes: the X chromosome and Y chromosome. A pair of X and Y results in a male while a combination of X and X results in a female. This XX/XY sex-determination system is one of the most familiar sex-determination systems and is applicable in human beings and most other mammals. In this system, the sex of an organism is determined by the sex chromosomes since these chromosomes bear the genes that control the development of reproductive organs and other sexual characteristics of an organism.


Synonym:

Compare: autosome

See also: X-chromosome, Y-chromosome


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Re: Mitochondrial DNA

There are genetic diseases caused by defects carried on the mitochondrial chromosome that can have clear phenotypic consequences. http://www.umdf.org/site/c.8qKOJ0MvF7LUG/b.7934627/k.3711/What_is_Mitochondrial_Disease.htm But a quick ...

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by wildfunguy
Wed Nov 19, 2014 8:18 pm
 
Forum: Genetics
Topic: Mitochondrial DNA
Replies: 6
Views: 1540

Re: Mitochondrial DNA

There are genetic diseases caused by defects carried on the mitochondrial chromosome that can have clear phenotypic consequences. http://www.umdf.org/site/c.8qKOJ0MvF7LUG/b.7934627/k.3711/What_is_Mitochondrial_Disease.htm

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by jonmoulton
Mon Sep 08, 2014 5:23 pm
 
Forum: Genetics
Topic: Mitochondrial DNA
Replies: 6
Views: 1540

Colorblindness Probability Help!

The incidence of an XXY karyotype is about 1 in every 1000 male births, the extra X chromosome coming either from the mother's egg or the father's sperm by nondisjunction during meiosis. Suppose the baby's father has red-green colorblindness. Would you predict that ...

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by kaylagh
Sun Sep 07, 2014 6:07 am
 
Forum: Genetics
Topic: Colorblindness Probability Help!
Replies: 0
Views: 535

Chromatin

I am all for skipping the mitochondrial chromosome for now:) Thank you for your explanation...it really helps:)

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by Hannamerika
Thu Sep 04, 2014 10:13 pm
 
Forum: Genetics
Topic: Chromatin
Replies: 2
Views: 1970

Re: Chromatin

Before replication there were 23 pairs of molecules, 23 of maternal origin and 23 of paternal origin, plus the maternally-contributed mitochondrial chromosome (which I'll ignore for the rest of this post). Counting chromosomal centromeres, there are 46 centromeres total. After replication there ...

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by jonmoulton
Thu Sep 04, 2014 3:04 pm
 
Forum: Genetics
Topic: Chromatin
Replies: 2
Views: 1970
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