Produced by Bryan Ness, Keith Edkins and the Online Distributed Proofreading Team at https://www.pgdp.net (This book was produced from scanned images of public domain material from the Google Print project.) Transcriber's note: A few typographical errors have been corrected: they are listed at the end of the text. * * * * * Page numbers enclosed by curly braces (example: {25}) have been incorporated to facilitate the use of the Table of Contents. * * * * * Tables which have been divided into two parts widthwise are marked with a double ~ on the original common edge. * * * * * SEX-LINKED INHERITANCE IN DROSOPHILA BY T. H. MORGAN AND C. B. BRIDGES [Illustration] WASHINGTON PUBLISHED BY THE CARNEGIE INSTITUTION OF WASHINGTON 1916 CARNEGIE INSTITUTION OF WASHINGTON PUBLICATION NO. 237. PRESS OF GIBSON BROTHERS, INC. WASHINGTON, D. C. * * * * * {3} CONTENTS. PAGE. PART I. INTRODUCTORY 5 Mendel's law of segregation 5 Linkage and chromosomes 5 Crossing-over 7 The Y chromosome and non-disjunction 8 Mutation in _Drosophila ampelophila_ 10 Multiple allelomorphs 11 Sex-linked lethals and the sex ratio 14 Influence of the environment on the realization of two sex-linked characters 16 Sexual polymorphism 17 Fertility and sterility in the mutants 18 Balanced inviability 19 How the factors are located in the chromosomes 20 The sex-linked factors of _Drosophila_ 21 Map of chromosome X 22 Nomenclature 24