46 FUNDAMENTAL PRINCIPLES 



microgametes. These terms are common to both botany and zoology, 

 the same being true of another term, zygote, which is applied to the cell 

 resulting from the union of a sperm cell and an egg cell in fertilization. 

 This union of two sex cells is also known as syngamy. This sexual type 

 of reproduction is characteristic of higher animals, while asexual reproduc- 

 tion, which is any type not involving these sex cells, occurs chiefly in 

 lower ones. 



