254 



BREEDING 



same gamete with wrinkled, and a relation of spurious 

 allelomorphism would thus be established between 

 these two characters. 



The explanations of the results of the four kinds 

 of mating made by Doncaster would then be repre- 

 sented by the following schemes. The dominant 

 and recessive member of the pair of characters 

 relating to colour, namely grossulariata and lacticolor, 

 are written D and R respectively ; and the dominant 

 and recessive members of the pair of characters 

 relating to sex are written ? and (J respectively. 

 The gametes are written outside the square, the zygotes 

 inside the squares, and underneath the zygotic form- 

 ulae the actual character and sex of the zygote : — 



1. Lacticolor $ x grossulariata $ produces 50 per 

 cent, cjs and 50 per cent. $s, all grossulariata. Thus : — 



^ 



CO 



O 



fe 



2. Fl grossulariata $ x Fl grossulariata <? pro- 

 duces 50 per cent, gross. cJ, 25 per cent, gross, $, and 

 25 per cent. lact. ? : — 



