Turn to this site for an overview of the explanations that have been proposed for inheritance. This Exploration is an introduction to some important ideas in the history of science.

"Biological Conceptions of Antiquity" from the Dictionary of the History of Ideas
http://etext.lib.virginia.edu/cgi-local/DHI/dhi.cgi?id=dv1-31

Think about: Why is it necessary to consider the definition of life when studying early views of heredity?

"Evolution and Philosophy: An Overview" in the Talk.Origins Archive
http://www.talkorigins.org/faqs/evolphil.html

Think about: What intellectual currents influenced Darwin's ideas about evolution?

"The Ovary of Eve: Preformation," a book review in the Journal of Sex Research
http://www.findarticles.com/p/articles/mi_m2372/is_4_35/ai_53390362

Think about: What is preformation and why was it a viable idea?