ABSTRACT
The inheritance of hereditary characters in man does not differ in principle from heredity in other organisms, but the study of human genetics is so important and differs so much from animal or plant genetics in the methods which it employs that it must be given separate consideration. Since controlled breeding is impossible, genetic analysis has to be carried out by special and rather roundabout methods, which will be discussed in this chapter. We shall first consider the study of rare mutant genes with relatively clear-cut effects and then pass on to the analysis of the genetic differences which exist within a population of what we should call "normal" men and women.
