444 



Plant-Breeding 



tH 



EGG CELLS 



th 



Phenotypes = ttHH, tthh. 

 Genotypes = ttHH, 2 ttHh, 1 tthh. 



Problem 7. 



Tall, large-round (TL) X dwarf, small plum-shaped (tl) = Tall 

 intermediate (TtLl). 



F l gametes = TL; Tl] tL; tl. 



POLLEN GRAINS 

 TL Tl tL tl 



EGG CELLS 



TL 



Tl 

 tL 



tl 



It must be remembered in this problem that we have incom- 

 plete dominance in one allelomorphic pair, therefore the number 

 of visible types is different than in cases where both units exhibit 

 dominance. 



