Carey, Gregory. Human Genetics for the Social Sciences. Text, exercises, practice tests, and links for learning human genetics.
Shaun Purcell's Behaviour Genetics Interactive Modules (An online introduction to BG research). Designed to accompany Statistical Methods in Quantitative Genetics by Shaun Purcell, the appendix to the 4th edition of Behavioral Genetics.
Genetics A self-learning course by Jamie Love.
Kimball's Biology Pages An online biology textbook by John Kimball.
Ergito. A comprehensive online site that covers the entire life sciences, including genetics, biochemistry, molecular biology, cell biology, development, immunology, and neurobiology.
Nature Encyclopedia of the Human Genome