Premium
ESTIMATING THE STRENGTH OF SEXUAL SELECTION FROM Y‐CHROMOSOME AND MITOCHONDRIAL DNA DIVERSITY
Author(s) -
Wade Michael J.,
Shuster Stephen M.
Publication year - 2004
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.0014-3820.2004.tb01741.x
Subject(s) - biology , selection (genetic algorithm) , sexual selection , homo sapiens , evolutionary biology , genetics , population , y chromosome , mitochondrial dna , gene , demography , artificial intelligence , sociology , computer science , anthropology
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 N e 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 N e is much smaller for males than it is for females. We derive both nonequilibrium and equilibrium expressions for F ST in terms of I and show how the portion of I owing to sexual selection, I mates , 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.