CONSEQUENCES OF CHANGE 



R B 



B B 



RRRJ BB 



cO'i 



td 



RRR- '' BBB 



Fig. 33. — The pods (slightly reduced) and the chromosomes ( X 1,000) o( Raphanus 

 (R), brassica (B), and their hybrids with R and B chromosomes in different numbers 

 (influencing fertility and therefore size) and different proportions (influencing shape) 

 (after Karpechenko, 1927). 



136 



