Sex-determining mechanisms in vertebrates

doi:10.1017/CBO9780511542053.008

Chapter 7 - Sex-determining mechanisms in vertebrates

Published online by Cambridge University Press: 06 August 2009

Sarah B.M. Kraak and

Ido Pen

Edited by

Ian C. W. Hardy

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Sarah B.M. Kraak: Affiliation:
Netherlands Institute for Fisheries, Research, The Netherlands
Ido Pen: Affiliation:
Zoological Laboratory, University of Groningen, The Netherlands
Ian C. W. Hardy: Affiliation:
University of Nottingham

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Summary

Vertebrates have various sex-determining mechanisms. These have been broadly classified as either genotypic sex determination (GSD) or environmental sex determination (ESD). This terminology, however, may obscure the facts that mixtures between genotypic and environmental sex determination exist, and that genotypic and environmental sex determination may themselves be the extremes of a continuum. Sex ratio evolution plays an important role in the evolution of sex-determining mechanisms.

Introduction

This chapter starts with the proximate aspects of sex-determining mechanisms (section 7.3). We introduce the traditional classification of sex-determining mechanisms that exist in vertebrates (section 7.3.1) and the distribution of mechanisms among extant vertebrate taxa (section 7.3.2). At phylogenetically shallow levels, different mechanisms are present. We describe how the existence of either male or female heterogamety, or ESD is usually established for individual species or taxa (section 7.3.3). Cases of mixed sex determination, i.e. combinations of GSD and ESD, are also observed (section 7.3.4) and we caution that this phenomenon has implications for sex identification by molecular markers (section 7.3.5). We stress that phenotypic sex generally has environmental and genetic components and discuss a model that attempts to unify sex determination by stating that sex determination in all vertebrates is mediated by differential growth of the embryo (section 7.3.6).

In the second part of the chapter we discuss the evolution of sex-determining mechanisms. Evolution from one system to another can be quite rapid (section 7.4). We stress that sex ratio selection plays an important role in the evolution of sex-determining mechanisms (section 7.4.1).

Type: Chapter
Information: Sex Ratios
Concepts and Research Methods
, pp. 158 - 177

DOI: https://doi.org/10.1017/CBO9780511542053.008 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2002

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Chapter 7 - Sex-determining mechanisms in vertebrates

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