GLOSSARY 621 
Unit Characters.—Those characters which behave as units in heredity. 
Unit Factor.—See Factor. 
Vaccine.—The modified virus of any specified disease introduced into the body 
by inoculation with a view to prevent or mitigate the disease or to confer immunity. 
Variate.—A single magnitude determination of a character. 
Variety.—A group of individuals within a species which constantly differ in one 
or more characters from the species type. 
Vegetative Mutation.—A mutation occurring in any somatic cell. 
Zygote.—A fertilized ovum or the product of the conjugation of gametes; hence, 
for brevity, an organism resulting from fertilization. 
Zygotic.—Of or pertaining to a zygote. 
Zygomorphic.—lIrregular flowers which are divisible into similar halves in only one 
plane. 
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