This interactive activity, adapted from the Dolan DNA Learning Center, illustrates how Gregor Mendel used purebred yellow and green peas to show that some genes are dominant and others are recessive.

This animated lesson will explain how genes are inherited in pairs, one from the mother and one from the father.

Is your room a mess? Does your nose have freckles on it like your mom's? Are your eyes the same color as your dad's? Which one of these things does not belong in lessons about heredity? Give these investigations a whirl while learning...

Because of T. B. Macaulay,early president of Sun Life Insurance,a small herd of Holstein cattle grow to become one of the most purebred herds in the world today. Archival photographs and stories of the family and farm are included.

From ABC News in Science, Anna Salleh's article discusses the findings of a U.S. study related to dogs looking like their owners. The study also deals with the purebred vs. mongrel issue in choosing a dog.