TABLE OF CONTENTS 



FOREWORD VII 



I INTRODUCTION 1 



II DESCRIPTION 6 



III CULTURE 12 



IV GENE MUTATIONS 22 



V RECORDING OF DATA 69 



VI SEX CONDITIONS 74 



VII SEX DETERMINATION 91 



VIII LINKAGE 103 



IX ENVIRONMENTAL EFFECTS 121 



X CONCLUSION 139 



APPENDIX 143 



BIBLIOGRAPHY 149 



GLOSSARY 181 



INDEX 193 



' 160 



