o-k 



THEORY OF EVOLUTION 



of a different organism. We can explain this 

 result as due to the assortment of factors for 

 these characters in the germ cells according to 

 a definite law. 



As a second illustration let me take the clas- 



f^ 



n^ 



PARENTS 



n i 



YR GW 



G W 



YR 

 YR 



YW 



YW 



GR 

 GR 



GW 

 GW . M- 



Fig. 22. Diagi-am to show the history of the factor pairs 

 yellow-green and round-wrinkled of the cross in Fig. 21. 



