230 



THE BEHAVIOUR OF POLYPLOIDS 



®^v 



300- 



0i 



200 

 100- 



300 



200 



H 



©^ 



^•e@ 



-100 







Diploid-.Gametic NumbersJetraploid 



Fig. 77. — Graph showing the relationship between the numbers of 

 species having certain low haploid numbers and the numbers of 

 species having twice as many chromosomes. (From Table 38.) 



