244 PRINCIPLES OF POULTRY BREEDING 



18. Explain procedure in testing an individual to determine its purity of 



breeding. 



19. Define fecundity. 



20. Outline two views now held as to the transmission of fecundity. 



21. Enumerate five points which cover the practical application of the teach- 



ing of inheritance of egg production. 



22. Define the law of variation. 



23. Enumerate, define, and give examples of four distinct types of variations. 



24. What is a mutation? Give an example. 



25. Define atavism. 



26. Name three factors which influence reversion. 



27. Define the law of correlation. 



28. Exemplify by comparing the body characteristics of the fowl with egg 



production . 



29. Define prepotency; give example. 



