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chapter_2-1 - Friday Chapter 2 Part I(of II Mendels...

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Friday, January 22, 2010 Chapter 2, Part I (of II) Mendel’s Breakthrough Assignment Chapter 2 problems: 1-5, 7-9, 11-15, 18-20, 22, 23, 26, 29, 33
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Pre-Mendel Artificial selection Definition = Purposeful control over mating by selecting parents Practiced since before recorded history Domestication of animals Selective breeding of plants Breeders could not explain why traits would sometimes disappear and then reappear in subsequent generations
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Historical theories of inheritance 1) Male parent contributes most features (e.g. homunculus, N. Hartsoiker, 1694). How was this hypothesized?
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Historical theories of inheritance 1) Blended inheritance is the theory that parental traits become mixed forever in a combination in the offspring
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State of genetics in early 1800’s What is inherited? How is it inherited? What is the role of chance in heredity?
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Gregor Mendel (1822-1884)
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Keys to Mendel’s experiments 1) Chose garden pea as model 1) Self-fertilizing, but easy to cross-fertilize 2)
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