The Genetic and the operative evidence relating to secondary sexual characters

Focusing on the interplay between genetics and the development of secondary sexual characteristics, this work by Thomas Hunt Morgan delves into the scientific evidence that links heredity to physical traits associated with sex. It explores the mechanisms of genetic inheritance and the role they play in the expression of these traits, offering insights into evolutionary biology and the complexities of sexual differentiation. Morgan's research provides foundational knowledge that has influenced contemporary understanding of genetics and sexual characteristics.