144 



THE THEORY OF THE GENE 



chromosomes, which is the haploid number of the Taba- 

 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. 



First polapbody 



8' 



\i/ 



Eg"g nucleus 3^ 



Division of 



first pole.f tody 



Second polar i)ody 



Sperm 1^8 



Male 8^(16) or Female 8^(l6) -f B''(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 



