SEX INHERITANCE 119 
In another case (A of Fig. 36 G) sex-linked 
characters were present that appeared in the 
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 normally 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 the pole with the other chromosomes 
(Fig. 36 H), then one of the two nuclei that re- 
sulted from such a division was XX in constitution 
