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Introduction to Pedigrees

Introduction to Pedigrees

Genealogy of the Lee family of Virginia and Maryland.
Courtesy of the US Library of Congress.

A pedigree shows how a trait is inherited over several generations. Dr. Lisa Meffert explains why pedigrees are important, and the key factors scientists consider when studying pedigrees.

Author(s): Deanne Erdmann, MS, and Nancy Moreno, PhD
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Avian Influenzas: Ability to Change (part 1)

Avian Influenzas: Ability to Change (part 2)

Pandemics of the 20th Century

Brief History of Modern Cloning

Somatic Cell Nuclear Transfer (SCNT)

Stem Cells and Therapeutic Cloning

Ecosystems

Modern Evolutionary Theory

Natural Selection

Mendel's Model of Particulate Inheritance

Hardy-Weinberg Principle

Deviations from the Hardy-Weinberg Equilibrium

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