HETEROPLOIDS 



179 



mosome are less viable than the normal, hence deficiencies 

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

 cells (n+1) are not transmitted at all through the pollen 



Ftg. 102. 



Normal or diploid type of capsule of Datura (2u) as contrasted 

 (below) with 2n-j-l and 2n-f2 types of capsule. (After Blakeslee.) 



(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. 



