Nucleus and Chromosomes 



45 



best classification for the clistrilnitcd c-mitosis, or bi-inctaphase,"'' is 

 a subtvpe of the exploded metajjhase. A somatic meiosis is not con- 

 ceiialile for the pollen tube, yet the distributed c-mitosis is like the 

 cases upon which evidence for somatic meiosis has been built. 



Seven years after the distributed c-mitosis was first published and 

 illustrated'^^ the term was coined."-^ This is preferable to somatic 

 meiosis.-^'^ An unfortunate confusion in terms arises because one word 

 has been used in two different instances to describe entirely different 

 processes: The word pseudoauapJuise~ is used for the distributed, so- 

 called bipolar arrangement of the c-pairs. In another instance, pseudo- 

 (1)1(1 p! I ase is synonomous with colchicine-anaphase.^'"' The word should 



Fig. 2.9 — Stages of recovery of arrested prophases in epidermal cells of Siredon after 

 colchicine treatment. (Compare with Fig. 2.2A). Acetocarmine smear. A. Slight swell- 

 ing of the chromosomes which have retained their prophasic disposition. B, C. Gradual 

 loosening of the chromatic material of similar chromosomes: catachromasis. D. Resti- 

 tution nucleus, formed by the fusion of the swollen chromosomes, which is already 

 noticeable in C. (After Ries) 



