THE MECHANISM OF REPKODUCTION 39 



somes characteristic of the body cells (Fig 10), and since 

 it is a matter of chance what gametes unite, such gametic 

 differences as we have illustrated would give a possibility 

 of obtaining 8 x 8 or 64 types of zygotes. 



Fio. 10. 



nucleus; observe 

 not fuse. (After Guyer.) 



i. Diagram to illustrate fertilization; cf , male pronucleus; ? , female pro- 

 lerve that the chromosomes of maternal and paternal origin, respectively, do 



V ftor fiiiver 1 



The mechanism of the process of gametogenesis and 

 fertilization in animals need not concern us further here. 

 "We must speak of the process in the seed plants, however, 

 for a rather odd phenomenon occurs there to which there 

 will be occasion to refer later. 



