180 THE CHROMOSOMES 
Fig. 47B.—Chromosomes of normal and of giant nightshade. a, pollen 
mother cell of nightshade, with 36 chromosomes. 6, somatic cell 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.) 
