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Updated: July 10, 2025
In the majority of fishes, in which fertilisation is external and no care is taken of the eggs or young, there are no somatic sexual differences. Moreover, somatic sexual characters where they do occur have no common characteristics either in structure or position in the body. It may be said that any part of the soma may in different cases present a sex-limited development.
In fact, both of my textbooks, the "Applied Biology" and the "Introduction to Biology," which emphasize reproduction of organisms more than other high-school books, have been used throughout in coeducational classes. However, these books stop where the problems of human life begin and should be supplemented by lessons for sex-limited classes.
The real problem, then, is the sex-limited heredity, and we shall consider later whether in this kind of heredity also there are characters of internal as well as external origin, blastogenic as well as somatogenic. Mendelism And The Heredity Of Sex
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