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University of Illinois Chicago: Human Genetics: Mendelian Inheritance
Great genetics site with a very good section on Punnett squares.
PBS
Pbs Teachers:america's Stone Age Explorers
Discover how mitochondrial DNA (mtDNA) is inherited, and complete a pedigree chart by determining which individuals might share mtDNA with an unknown ancestor.
CK-12 Foundation
Ck 12: Biology: Human Inheritance Study Guide
This comprehensive study guide covers the main terms and concepts needed for a unit on human inheritance.