Translator Disclaimer
1 July 2004 ESTIMATING THE STRENGTH OF SEXUAL SELECTION FROM Y-CHROMOSOME AND MITOCHONDRIAL DNA DIVERSITY
Author Affiliations +
Abstract

We show that a sex difference in the opportunity for selection results in sex differences in the strength of random genetic drift and thus creates different patterns of genetic diversity for maternally and paternally inherited haploid genes. We derive the effective population size Ne for a male-limited or female-limited haploid gene in terms of I, the “opportunity for selection” or the variance in relative fitness. Because the variance in relative fitness of males can be an order of magnitude larger than that of females, the Ne is much smaller for males than it is for females. We derive both nonequilibrium and equilibrium expressions for FST in terms of I and show how the portion of I owing to sexual selection, Imates, that is, the variation among males in mate numbers, is a simple function of the F's for cytoplasmic (female inherited) and Y-linked (male inherited) genes. Because multiple, transgenerational data are lacking to apply the nonequilibrium expression, we apply only the equilibrium model to published data on Y chromosome and mitochondrial sequence divergence in Homo sapiens to quantify the opportunity for sexual selection. The estimate suggests that sexual selection in humans represents a minimum of 54.8% of total selection, supporting Darwin's proposal that sexual selection has played a significant role in human evolution and the recent proposal regarding a shift from polygamy to monogamy in humans.

Michael J. Wade and Stephen M. Shuster "ESTIMATING THE STRENGTH OF SEXUAL SELECTION FROM Y-CHROMOSOME AND MITOCHONDRIAL DNA DIVERSITY," Evolution 58(7), 1613-1616, (1 July 2004). https://doi.org/10.1554/03-451
Received: 30 July 2003; Accepted: 31 March 2004; Published: 1 July 2004
JOURNAL ARTICLE
4 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top