CK-12 Foundation
Ck 12: Life Science: Human Egg Cells
[Free Registration/Login may be required to access all resource tools.] When a baby girl is born, her ovaries contain all of the eggs they will ever produce. But these eggs are not fully developed. They develop only after she starts...
National Institutes of Health
National Institutes of Health: Potential Uses of Human Stem Cells
Stem cell therapy holds a great deal of promise, but years of intensive research are needed to develop their full potential. This informative site looks at the possibilities and challenges related to the potential uses of stem cells.
BBC
Bbc: Gcse Bitesize: Mitosis and Cell Specialisation
This lesson focuses on cloning. Plants can make identical copies of themselves by asexual reproduction, for example by tubers and runners. Humans have been cloning plants for years and have recently started to develop techniques to clone...
CK-12 Foundation
Ck 12: Life Science: Fertilization
[Free Registration/Login may be required to access all resource tools.] The sperm and egg don't look anything like a human baby. After they come together, they will develop into a human being. How does a single cell become a complex...