REVIEW 243 



whether for meat or fancy points. An individual may be all that 

 could be desired with respect to certain characteristics, yet might 

 not transmit these particular traits to its progeny because it lacks 

 prepotency. 



Certain breeds are especially prepotent with regard to some 

 well-defined characteristics; for example, Games, when crossed 

 with other breeds, transmit their distinctive traits to a large per- 

 centage of the progeny. 



Prepotency in individuals varies greatly, and is indicated both 

 by the resemblance of the progeny to the parent and to one another. 

 Prepotency is increased in the individual and in the breeds with 

 increased purity of blood, stronger constitutional vigor, and in- 

 breeding. 



Sex Limitation. The power of one sex to transmit character- 

 istics, and the limitation of the other sex in the same respect, 

 is a disputed point among the closest students. In the light 

 of recent work the general opinion seems to be that there is 

 such a difference between sexes, and that it is very important in 

 breeding poultry either for color pattern or for egg production. 

 In egg production the male parent is believed to have the 

 'greater transmitting power. 



REVIEW. 



1. Define poultry breeding. 



2. In what respect is this science a complex one? 



3. Point out some facts which call for marked improvement in our breeds. 



4. Compare the composition of milk and eggs. 



5. What is the chief aim of the poultry breeder? 



6. Enumerate some of the problems which are confronting the poultry breeder. 



7. What is the basis of value in poultry? 



8. Enumerate and discuss six fundamental principles which underlie pro- 



gressive breeding. 



9. Define three fundamental factors which affect all individuals in greater 



or less degree. 



10. Discuss environment and its relation to all progeny. 



11. Discuss the effect of functional activities upon the individual and its 



offspring. 



12. State briefly the development of the laws of breeding. 



13. Define the law of heredity and give a practical example. 



14. Discuss three direct benefits to be derived from the action of this law. 



15. Define crossbreeding or hybridizing. 



16 What is the first assertion of Mendel's law? 



17. Discuss the influence of a dominant character when a cross is made. 

 Explain with equation, according to Mendel's law. 



