SEX INHERITANCE 119 



In another case {A of Fig. 36 G) sex-linked 

 characters were present that appeared in tlie 

 gynander. In this gynander the left side of the 

 thorax and abdomen was male, but the head was 

 entirely female. The male parts all showed the 

 usual sex differences, and also the sex-linked re- 

 cessive character yellow body-color (unstippled). 

 This gynander arose from an egg, carrying an 

 eosin-bearing X, fertilized by an X-sperm bearing 



Fig. 36H. — Diagram illustrating elimination of one sex-chromosome. 



the genes for yellow and white. The zygote was 

 therefore female, and the female parts of the gynan- 

 der retain the above constitution. If at the first 

 segmentation division, the paternal (yellow white) 

 X divided normalh^ and each daughter nucleus 

 received a yellow white X, but one daughter chro- 

 mosome of the other or maternal (eosin) X failed 

 to pass to tlie \)()\v witli tlie otlier clu-omosomes 

 (Fig. 36 H), then one of the two nuclei tliat re- 

 sulted from such a division was XX in constitution 



