Autosome

This article is about a type of chromosome. For the ancestral discovery method using autosomal DNA, see Genealogical DNA test#Geographic origin tests.

An autosome is a chromosome that is not a sex chromosome ' that is to say there are an equal number of copies of the chromosome in males and females.^[1] For example, in humans, there are twenty-two pairs of autosomes, and, in addition, there are the X and Y sex chromosomes.

Human chromosomes
Female (XX)	Male (XY)

There are two copies of each autosome (chromosomes 1-22) in both females and males. The sex chromosomes are different: there are two copies of the X chromosome in females, but males have a single X chromosome and a Y chromosome.

[edit] See also

Roberts Syndrome

[edit] References

^ Griffiths, Anthony J. F. (1999). An Introduction to genetic analysis. New York: W.H. Freeman. ISBN 071673771X. http://www.ncbi.nlm.nih.gov/books/bv.fcgi?highlight=autosome&rid=iga.section.222.

Genetics: chromosomes

General

Karyotype – Ploidy – Meiosis

Classification

Autosome – Sex chromosome – Microchromosome

Evolution

Chromosomal inversion – Chromosomal translocation – Polyploidy – Paleopolyploidy

Structure

Nucleosome – Telomere – Chromatid

Chromatin	Euchromatin – Heterochromatin

Histone	H1 – H2A – H2B – H3 – H4

Centromere	A – B – C1 – C2 – E – F – H – I – J – K – M – N – O – P – Q – T

v ' d ' e Human chromosomes

Autosome	1 – 2 – 3 – 4 – 5 – 6 – 7 – 8 – 9 – 10 – 11 – 12 – 13 – 14 – 15 – 16 – 17 – 18 – 19 – 20 – 21 – 22

Sex chromosome	X – Y – Pseudoautosomal region

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