POLAR 

 BODY 



EGGS 



SPERM 



RED 9 



4 



POLAR 

 BODY 



ECCS 



5PEPM 



Fig. 35. 



Diagram illustrating the fertilization of an XXY-egg, whose X- 

 chromosomes carry each the gene for white eyes, by a red-eyed 

 male. In the upper half of the diagram the fertilization of the 

 four possible kinds of eggs by the red-eyed producing X-chromo- 

 some of the male is shown. In the lower part of the diagram the 

 fertilization of the same four kinds of eggs by the Y-chromosome 

 of a male is shown. 



