244 PRINCIPLES OF POULTRY BREEDING 
18. 
Explain procedure in testing an individual to determine its purity of 
breeding. 
. Define fecundity. 
. Outline two views now held as to the transmission of fecundity. 
. Enumerate five points which cover the practical application of the teach- 
ing of inheritance of egg production. 
. Define the law of variation. 
. Enumerate, define, and give examples of four distinct types of variations. 
. What is a mutation? Give an example. 
. Define atavism. 
. Name three factors which influence reversion. 
. Define the law of correlation. 
. Exemplify by comparing the body characteristics of the fowl with egg 
production 
. Define prepotency; give example. 
