FERTILITY AND STERILITY IN DROSOPHILA 

 AMPELOPHILA 



I. STERILITY IN DROSOPHILA WITH ESPECIAL REFERENCE TO 



A DEFECT IN THE FEMALE AND ITS BEHAVIOR IN 



HEREDITY 



ROSCOE R. HYDE 



Department of Zoology, Columbia University 



CONTENTS 



Introduction •. 141 



Sterility and inbreeding 143 



1. Sterility in the inbred stock » 143 



2. Sterility in the truncate stock 146 



Behavior of sterility in heredity 147 



Crosses involving a sex-linked factor 162 



Discussion 165 



Conclusions 170 



Bibliography 171 



INTRODUCTION 



The following series of papers embodies the results of my work 

 on "FertiUty and Sterility in Drosophila ampelophila. " The 

 first paper deals primarily with a case of sterility in which the 

 female is affected, together with the effects of selection upon 

 female sterility and its behavior in transmission. The second 

 paper is concerned with the low fertility of a mutant, and the 

 behavior of this low fertility in heredity. The third study deals 

 with the effect on fertility of crossing different races. The fourth 

 study treats of the effect on fertility of crossing within and with- 

 out an inconstant race. The work has been in continual progress 

 since the fall of 1911 when it was undertaken at the suggestion of 

 Prof. T. H. Morgan. 



Two investigators have studied sterility in Drosophila. Castle 

 and his students found sterile individuals of both sexes in their 



141 



