Ch. 2 Outline

Ch 2 outline

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Unformatted text preview: Mendel’s Mendel’s Breakthrough Patterns, Particles, and Principles of Heredity Chapter 2 Outline of Mendelian Genetics Outline of Mendelian Genetics The historical puzzle of inheritance and how Mendel’s experimental approach helped solve it Mendel’s approach to genetic analysis including his experiments and related analytic tools A comprehensive example of Mendelian inheritance in humans; disease transmission of single gene traits will also be examined Gregor Mendel (1822­1844) Gregor Mendel (1822­1844) Themes of Mendel’s work Themes of Mendel’s work Variation is widespread in nature Observable variation is essential for following genes (otherwise no visible way of noting differences among progeny) Variation is inherited according to genetic LAWS and not solely by chance Mendel’s laws apply to ALL sexually reproducing organisms Artificial selection has been an important practice since before recorded history Domestication of animals (ancient civilizations) Selective breeding of plants (aesthetic and commercial) The historical puzzle of inheritance The historical puzzle of inheritance 0 19th century – precise techniques for controlled mating in plants and animals to produce desired traits in many of the offspring Breeders could not explain why traits would sometimes disappear and then reappear in subsequent generations State of genetics in early State of genetics in early 1800’s • What is inherited? How is it inherited? What is the role of chance in heredity? • • Mendel’s workplace Mendel’s workplace Historical theories of inheritance Historical theories of inheritance One parent contributes most of the feature (homunculus, 1694) Blending inheritance – parenta...
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