This document provides historical background on the development of theories of inheritance from ancient Greece to the 19th century. It discusses early Greek theories proposed by Hippocrates and Aristotle. It then covers the intellectual foundations laid by scientists like van Leeuwenhoek, Linnaeus, Lamarck, Darwin, Wallace, and Galton. Key events included the proposal of the first evolution theory by Lamarck, the development of the theory of natural selection by Darwin and Wallace, and Galton's work establishing the field of behavioral genetics. The document traces the gradual development of understanding of inheritance and evolution over centuries.