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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.
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{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