Children often look like their parents. They have their father's nose and their mother's eyes. Why is that?
Some animals have very strange colors and characteristics. How did they come to be that way?
Humans and other organisms look and act the way they do because of the traits they inherit from their parents and the influences of the environment. "Nature versus Nurture" is an age old argument. These websites explore heredity and the role environment plays in shaping the way organisms look and act.
DNA From the Beginning This is an extemely useful website to explain the basics of DNA and its role in heredity.
There are brief concept summaries, animations, images, audio and video, problems and other useful links. This resource progresses from simple explanations into quite a bit of detail.