This article provides a discussion of DNA and how it replicates. Includes a chromosome map of a human male, a close-up of chromosomes just before cell division and a close up of a DNA molecule.

This interactive site provides animations and activities in several areas of physiology. The images are simple, but clear. The accompanying text provides a good description of the process being shown.

In this unit students will identify different kinds of genetic traits and how they are passed on from generation to generation. It contains 18 interactive activities.