Format

Send to

Choose Destination
Trends Genet. 2009 Jun;25(6):278-84. doi: 10.1016/j.tig.2009.04.005. Epub 2009 May 27.

The different levels of genetic diversity in sex chromosomes and autosomes.

Author information

1
Department of Evolutionary Biology, Evolutionary Biology Centre, Norbyvägen 18D, SE-752 36 Uppsala, Sweden. Hans.Ellegren@ebc.uu.se

Abstract

Sex chromosomes and autosomes differ in their effective population size, mutation and demography, all of which affect the relative level of genetic diversity within the genome. Moreover, natural selection acts differentially on the two chromosomal categories, for example, because recessive mutations are directly exposed to selection on the single X chromosome of males. Recent genome analyses reveal a heterogeneous picture of the sex-chromosome-to-autosome diversity ratio in different organisms. Reduced X chromosome diversity has been interpreted to reflect demographic features such as bottlenecks and male-biased dispersal, whereas more equal diversity in sex chromosomes and autosomes has been explained by polygynous mating systems.

PMID:
19481288
DOI:
10.1016/j.tig.2009.04.005
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center