THE DUALITY OF INHEEITANCE 



Fig. 8, upper line. But in the male wasp, 

 whose cells are in the N condition at the be- 

 ginning, one of these divisions is so far sup- 

 pressed that the resulting cell products are of 

 very unequal size, and the smaller one contains 

 no nuclear material. The other then gives rise 

 to two sperm-cells, each possessing the origi- 

 nal N nuclear condition, while the small non- 

 nucleated cell degenerates. See Fig. 8, lower 

 line. 



In conclusion, I wish to introduce two tech- 

 nical terms, which it will be convenient for us 

 to use in subsequent discussions. These are 

 gamete and zygote. A reproductive cell (either 

 &g^ or sperm) which is in the reduced condi- 

 tion (N) ready for union in fertilization is 

 called a gamete. The result of fertilization is 

 a zygote, a joining together of two cells each 

 in the N condition. The result is a new or- 

 ganism, at first a single cell, in the 2N 

 condition. 



9,fi 



