Results of Mating 169 



the offspring produced by the different germ cells of even 

 the same pair of parents are hereditarily diverse ; a single 

 pair of parents may, in plants or certain animals, produce 

 in Mendelian inheritance hundreds of hereditarily different 

 kinds of offspring. The only reason why this may not 

 occur in the highest animals and man is that in these cases 

 relatively few of the possible combinations develop, since 

 but few offspring are produced. 



In these respects, therefore, mating does the same thing 

 in the Protozoa that it does in the higher organisms. In 

 both it brings biparental inheritance and the production of 

 hereditarily diverse stocks. 



