Prometheus, or, biology and the advancement of man / by H.S. Jennings.

  • Herbert Spencer Jennings
Date:
[1925]
Catalogue details

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

Credit: Prometheus, or, biology and the advancement of man / by H.S. Jennings. Source: Wellcome Collection.

    41/112 (page 37)
    BIOLOGICAL BACKGROUND did.* The differences between the diverse cells of the body are, therefore, not in these substances, not in the genes they contain, but in the remaining part of the cells, the cytoplasm. These differentiations have been produced by the interaction of the genes with the cytoplasm. It is in this way that the complex adult body, with its typical pattern of structures, is produced. In producing these structures, the genes interact, not only with each other, with the cytoplasm, with the oxygen from the surrounding medium, and with the food substances in the cytoplasm ; but also, what is most striking and important, with products from the chemical processes in neighbouring cells. Necessarily, then, this complicated inter- ♦ Like almost any biological generalization, this statement is subject to exceptions. But for most parts of most organisms it is true. [39]