Lecture 04 (1-25) - Lecture outline 1/25/07 Genetic...

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Lecture outline 1/25/07 Genetic Principles Discovered by Mendel Mendelian Inheritance in Humans Polygenic Inheritance Genetic and Environmental Factors Modern Evolutionary Theory Factors That Produce and Redistribute Variation Natural Selection Acts on Variation Review of Genetics and Evolutionary Factors Genetic Principles Discovered by Mendel Gregor Mendel (1822-1884) laid down the basic principles of heredity. Crossed different strains of purebred plants and studied their progeny. Worked with common garden peas and considered only one trait at a time. His work illustrates the basic rules of inheritance. Dominance And Recessiveness Recessive traits are not expressed in heterozygotes. For a recessive allele to be expressed, there must be two copies of the allele. Dominant traits are governed by an allele that can be expressed in the presence of another, different allele. Dominant alleles prevent the expression of recessive alleles in heterozygotes. Principle of Independent Assortment The distribution of one pair of alleles into gametes does not influence the distribution of another pair. The genes controlling different traits are inherited independently of one another.
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This note was uploaded on 04/02/2008 for the course ANTHRO 1 taught by Professor Wilkie during the Spring '08 term at University of California, Berkeley.

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Lecture 04 (1-25) - Lecture outline 1/25/07 Genetic...

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