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Science Buddies
Science Buddies: Pedigree Analysis: A Family Tree of Traits
Some characteristics, like the shape of your hairline, whether your earlobes are attached or detached, and whether or not you have freckles are inherited from your parents. In this science project you will learn about Mendelian traits,...
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University of Illinois Chicago: Human Genetics: Mendelian Inheritance
Great genetics site with a very good section on Punnett squares.