180 



THE CHROMOSOMES 



a 







I 



Fig. 47B. — Chromosomes of normal and of giant nightshade, a, pollen 

 mother oell of nightshade, with 36 chromo.somes. b, somatic coll of night- 

 shade, with 72 chromosomes, c, pollen mother cell of giant nightshade, 

 with 72 chromosomes, d, somatic cell of giant nightshade, with 144 

 chromosomes. (After Winkler.) 



