226 



BREEDING 



But to return to the case as it is. The union of 

 the gametes of the pink and white parents of the 

 cross may be represented as follows : — 



Gametes of 



pink-flowered 



farent 



Pb 



X 



Gametes of 



white-flowered 



parent 



pB 



Zygote 

 produced 



= PpBb 



The union of the gametes produced by this hybrid 

 would be represented as follows : — 



PB 



PB 



a 



Of 



Pb 



pB 



(J gametes 

 Pb pB 



pb 



pb 



The external appearance of the sixteen zygotes 

 shown in this Table is given on page 228. 



