144- 



THE THEORY OF THE GENE 



chromosomes, which is the haploid number of the -tsba- 

 cum species. One of these haplonts was "a reduced 

 replica" of the "variety" of the Tabacum parent, but the 

 expression of the characters was somewhat exaggerated. 



TV 



First polar body 



Egg nucleus q z 



Division of 

 first pol&r tody 



8 Second polar body 



Sperm (8 2 ) 



Male8 2 (l6)or Female 8 2 (l6) + 8 2 (16) =32 



Fig. 85. 

 Diagram illustrating the two maturation divisions of the egg of 

 the honey bee. The fertilization of the egg by the sperm is indi- 

 cated in the lower part of the diagram with a subsequent doubling 

 of the chromosomes by breaking into two parts. 



It was about three-fourths the height of the parent type ; 

 the leaves were smaller, the branches more slender, and 

 the flowers distinctly smaller. It was less vigorous than 

 the parent type; it bloomed profusely but produced no 

 seeds. Its pollen was completely defective. The other hap- 

 lont showed similar relations to the variety of Tabacum 



