MENDEL'S EXPLANATION 179 



tant a finger-end familiarity with such results is, 

 both to the student of heredity and to the prac- 

 tical breeder. It will be convenient, first, to display 

 them in tabular form, so as to obtain a general view 

 of them, and to see which have already been dealt 

 with, and which remain to be considered. * 



The first four of these types of mating have 

 already been considered. No. 1 represents the true- 

 breeding of pure dominants, according to the fol- 

 lowing scheme : — 



(J gametes 

 D D 



CO 

 OP 



to 



D 



D 



