The Principles of Heredity

The Principles of Heredity

The Principles of Heredity

The Principles of Heredity

Excerpt

Through its previous four editions this book has been designed to acquaint the beginning student of heredity with the facts and principles of inheritance. It has also been the purpose of the book to arouse and hold the interest of the student and to stimulate his thinking. To these ends human characters and other familiar examples have been chosen wherever feasible, and the discourse has been kept simple and straight-forward.

During each of the intervals between successive editions of the book, some new facet of genetics has developed to the point where it demanded inclusion in the text. Thus over the years there have been added, among others, discussions of giant chromosomes, of biochemical genetics, and of cytoplasmic inheritance. Such developments have not been lacking in the interval following the appearance of the fourth edition. The genetics of bacteria and viruses has now been brought to the point where a discussion of this topic seems imperative, and a chapter has been devoted to it. The new chapter has been correlated with the textual material on cytoplasmic inheritance and on genes and development, and these three chapters have been grouped together to form an integrated unit following the discussion of genes and mutations.

The phenomenon of pseudoallelism has become one of major interest, and a discussion of this topic is included in Chapter 26.

When the giant chromosomes were newly discovered, they were awarded a separate chapter in the text. It now appears that their study is so intimately concerned with the analysis of chromosomal aberrations that the material dealing with salivary chromosomes has been integrated with the treatment of aberrations. The discussion has been divided into two chapters, one dealing with variations in the numbers of chromosomes, and the other with rearrangements of chromosomal material. This division should provide a more effective teaching device.

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