Journal Article

The Impact of Founder Events on Chromosomal Variability in Multiply Mating Species

John E. Pool and Rasmus Nielsen

in Molecular Biology and Evolution

Published on behalf of Society for Molecular Biology and Evolution

Volume 25, issue 8, pages 1728-1736
Published in print August 2008 | ISSN: 0737-4038
Published online May 2008 | e-ISSN: 1537-1719 | DOI: https://dx.doi.org/10.1093/molbev/msn124
The Impact of Founder Events on Chromosomal Variability in Multiply Mating Species

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In species with heterogametic males, the relative levels of X chromosome versus autosome diversity hold key information about the evolutionary forces at work in a population. It has been shown that population size changes alter the ratio of X linked to autosomal (X/A) variation, with population size reductions and recent bottlenecks leading to decreased X/A diversity ratios. Here we use theory and simulation to investigate a separate demographic effect—that of founder events involving multiply mated females—and find that it leads to much stronger reductions in X/A diversity ratios than are produced by simple population size changes. Investigating the potential of this process to account for sharply reduced X-linked diversity in European Drosophila melanogaster, we find that this model yields predictions that are compatible with the empirical data.

Keywords: founder events; multiple mating; X-linked variation; autosomal variation; Drosophila melanogaster

Journal Article.  6749 words.  Illustrated.

Subjects: Evolutionary Biology ; Molecular and Cell Biology

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