MENDEL'S TWO LAWS 65 



four o'clock. In the germ-cells of the hybrid — the 

 so-called first fillial generation, or Fi — the elements 

 (or factors) that come from the two j^arents separ- 

 rate and half of the egg-cells come to carry one of 



Fig. 23. — Diagram of cross between 

 a yellow and a green pea. 



the original elements and half the other element. 

 Chance fertilization of any egg by any sperm (pol- 

 len) gives the numerical relation j^resent in the next 

 generation. 



These four cases serve to illustrate an important 

 fact. The character of the individual is not a measure 

 of the nature of the mature germ-cells that it will 



