HETEROPLOIDS 179 



mosome are less viable than the normal, hence deficiencies 

 in certain expected classes occur; in fact, these germ- 

 cells (n-j-l) are not transmitted at all through the pollen 



Fig. 102. 



Diploid type of capsule of Datura (2n) as contrasted with 2n+l 

 and 2n+2 types of capsule. (After Blakeslee, in Journal of 

 Heredity.) 



(or only to a slight extent), and through only about 30 

 per cent of the eggs. When these relations are allowed 

 for, the genetic results agree with expectation. 



