The Genetic Control of Developmental Relationships

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Abstract
The first step toward an understanding of how genes determine a character must be to describe exactly the development of the character. This may be done most easily with morphological traits. In various races of Lagenaria vulgaris and Cucurbita pepo the changes in length and width of the developing fruit were measured. These dimensions grow at the same relative rate, thus displaying "heterogonic" growth. Other dimensional relationships behave in the same way in this material. It is thus possible to express a trait of shape or pattern very simply by one or more constants. This suggests that a gene may be operative throughout development, and that it may control relationships rather than absolute rates.

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