Dictionary » A » Autosome



noun, plural: autosomes

(Science: Genetics)

Any chromosome not considered as a sex chromosome, or is not involved in sex determination. It occurs in pairs in somatic cells and singly in sex cells (gametes).


For instance, a human somatic cell will normally contain 23 pairs of chromosomes (total=46 chromosomes). Twenty-two (22) of these pairs will be autosomes, and only one of them will be a pair of sex chromosomes (the X and Y chromosomes).

In sex cells like egg cell and sperm cell where chromosomes occur singly (total=23), 22 of them are autosomes while the remaining one is a sex chromosome (either X or Y chromosome).

Word origin: Gk, comb. form of autós ,self + Gk soma, body.

Related forms: autosomal (adjective).

Synonym: euchromosome.
Compare: sex chromosome.
See also: chromosomes.

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Need help in an assignment

first of all thanks, second I also thought that this is the answer, but my doctor published her answers and according to her the answer is 4-autosome dominant which appears only in males. that means the first male must be homozygote recessive and the first female must hetrozygote, but as we ...

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by dreamtim
Sun Sep 09, 2012 4:05 pm
Forum: Genetics
Topic: Need help in an assignment
Replies: 17
Views: 11476

Re: Unidirectional ORI, Onion-Skin-Model

... surround the egg and produce the chorion. The genes encoding the chorionic proteins exist in two clusters (one on the X chromosome and one on an autosome). Only a single copy of each somatic gene is present. A developmentally controlled origin of replication, located within each gene cluster, ...

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by Rost
Thu Aug 30, 2012 6:52 am
Forum: Genetics
Topic: Unidirectional ORI, Onion-Skin-Model
Replies: 4
Views: 6613


If a sperm is haploid, and an autosome is not an allosome, then how many does that leave?

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by plasmodesmata11
Wed May 09, 2012 9:43 pm
Forum: Genetics
Topic: autosomes
Replies: 1
Views: 1719

Re: Lots of questions of heredity

Answer no. 6 can also be Autosome..

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by Blueberrysplash
Sun Dec 19, 2010 4:42 pm
Forum: Genetics
Topic: Lots of questions of heredity
Replies: 9
Views: 13070

Re: Autosome dominant

by kanagasundar
Fri Oct 15, 2010 5:21 am
Forum: Genetics
Topic: Autosome dominant
Replies: 3
Views: 5375
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