-,e chromosomes are seen 

 a tangle of fine threads 



1^ 



^ 



e' 



8 



The chromosomes are 

 separating from each other 

 and are thickening 



• 



>>Jjl ^ 



3 



Each chromosome has 

 split into two distinct 

 threads 



j4^ r^ 



4 



I 





s 



The newly divided chromosomes are moving away from each other 





'^W^iP** 



s 





9 



\oi\\ sets of chromosomes collect together at opposite sides of the cell and cell division takes 

 'lace. At the end of the process there are two distinct cells. The cell walls are not visible 



3 Chromosomes in the nucleus of cells from the growing tip of 

 onion root in different stages of cell division. (Photographs of fixed 

 and stained preparations reproduced by courtesy of Dr S. H. Revell, 

 Chester Beatty Research Institute) 



