Bio2153_ch2

Bio2153_ch2 - Chapter 2 Part I Mendels Breakthrough...

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Chapter 2, Part I 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 = 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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1) Male parent contributes most features (e.g., __________________, N. Hartsoiker, 1694). Historical theories of inheritance How was this hypothesized?
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Historical theories of inheritance 1) Blended inheritance –
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Group activity 1) Why were the homonuculus and blended inheritance hypothesized? 2) How do we know they are not true?
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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 ________________________ as model Self-fertilizing, but easy to cross-fertilize Produced large number of offspring each generation 2. Analyzed “___________________________ 3. Used ___________________________ lines 4. Controlled matings and _____________________________ 5. Analyzed large numbers of plants and ________________________________ 6. Mendel was _______________________ !
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Mendel’s first experiment
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Traits have dominant and recessive forms. Disappearance of traits in F1 generation and reappearance in the F2 generation disproves the hypothesis that traits blend.
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Traits have dominant and recessive forms Disappearance of traits in F1 generation and reappearance in the F2 generation disproves the hypothesis that traits blend. Trait must have two forms (“alleles”) that can
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This note was uploaded on 11/18/2010 for the course BIOL 2153 taught by Professor Larkin during the Fall '03 term at LSU.

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Bio2153_ch2 - Chapter 2 Part I Mendels Breakthrough...

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