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The Speciation of Modern Homo Sapiens$
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T. J. Crow

Print publication date: 2004

Print ISBN-13: 9780197263112

Published to British Academy Scholarship Online: January 2012

DOI: 10.5871/bacad/9780197263112.001.0001

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Preferential Sex Linkage of Sexually Selected Genes: Evidence and a New Explanation

Preferential Sex Linkage of Sexually Selected Genes: Evidence and a New Explanation

Chapter:
(p.251) Preferential Sex Linkage of Sexually Selected Genes: Evidence and a New Explanation
Source:
The Speciation of Modern Homo Sapiens
Author(s):

Klaus Reinhold

Publisher:
British Academy
DOI:10.5871/bacad/9780197263112.003.0014

This chapter discusses evidence and theory on sex chromosomal linkage of sexually selected traits that may be the key to a functional separation of sexual and natural selection. It reviews the evidence showing that the X chromosome has a disproportional share concerning the inheritance of sexually selected traits in animals with heterogametic males, and suggests a new explanation that relates this X bias with female choice of heterozygotic males. With numeric simulations, it shows that female choice of heterozygotic males is usually disadvantageous. Because this disadvantage cannot occur when females prefer X-linked male traits, preferential X linkage of sexually selected traits can be expected. As an alternative to fluctuating selection on sex-limited traits, the disadvantage of heterozygotic choice may thus explain the X bias observed for sexually selected traits.

Keywords:   sex chromosomal linkage, natural selection, heterogametic males, X linkage, heterozygotic choice, sexually selected traits

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