PBS
Nova: How Is Sex Determined?
This site focuses on the first 16 weeks of embryo development when the sex of the child is determined.
The Association of the British Pharmaceutical Industry
Abpi: Hormones and Their Effects
A complete, student-led lesson on the endocrine system. Students work their way through illustrated and animated tutorials, and answer review questions along the way. There is a self-checking quiz at the end of the lesson.
Healthline Media
Medical News Today: What Is Puberty?
Discover what puberty is and the difference between early puberty and late puberty in this informative article from Medical News Today. Learn what happens during girl's and boy's puberty, what causes it, and treatment options.
National Cancer Institute at the National Institutes of Health
Seer Training Modules: Introduction to the Reproductive System
Self-guided learning activity where students learn about the structure and function of the male and female reproductive systems. There is a short quiz at the end of the lesson to check for understanding.