THE DEVELOPMENT OF DOMINANT RUMPLESSNESS IN CHICK EMBRYOS

Abstract

TUDY of a genetic variant usually concerns three fairly distinct prob-S lems. The first is, necessarily, that of defining its nature-its morphological or physiological effect upon the organism. The second deals with the mechanism by which it is transmitted from one individual to others. The third problem involves the study of the development of the variant in order to determine when, where, and how the normal ontogeny is modified to produce the final effect.