The theory of the gene / by Thomas Hunt Morgan.

  • Thomas Hunt Morgan
Date:
1926
Catalogue details

Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: The theory of the gene / by Thomas Hunt Morgan. Source: Wellcome Collection.

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    PREFACE THE call for a revised edition of The Theory of the Gene has given me an opportunity to make several corrections of the original text as well as to bring into closer relation the references in the text to those in the bibliography. The bibliography has undergone a care¬ ful revision, a number of omissions have been made good, and a number of new references added. In the same year in which the first edition of the Theory of the Gene appeared, I published a short article in the Quarterly Review of Biology in which certain questions relating to sex and fertilization were discussed. This topic was not taken up in the first edition, although intimately related to the subjects there considered. The sexual un¬ ion of the plus and minus strains of certain fungi and algae, in relation to the fertilization of the eggs of the higher plants, raises a number of questions of fundamen¬ tal interest to biologists. With the permission of the pub¬ lishers, Williams, Wilkins, and Co., I have reprinted here those parts of the original article that bear on the ques¬ tion, as an extension of the chapter on ' ' Other Methods of Sex-Determination involving Sex Chromosomes. During the last two years many papers have appeared dealing with the number, and changes in number, of the chromosomes. It has not been possible to incorporate these new contributions, nor is it necessary, since, for the most
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