98 



THEORY OF EVOLUTION 



FIG. 50. The two maturation divisions of the sperm cell. 

 Four sperms result, each with half (haploid) the full number 

 (diploid) of chromosomes. 



some paternal chromosomes, i.e. one or the 

 other member of each pair. At the other di- 

 vision each chromosome simply splits as in 

 ordinary cell division. 



The upshot of the process is that the ripe 

 eggs (fig. 51) and the ripe spermatozoa (fig. 



