Chapter 14 - during gamete formation and randomly recombine...

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Biology 1107 Lecture #27 03-17-08 Chapter 14 Mendel and the Gene Idea
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Gregor Mendel 1822 -1884
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Conducted experiments using Pea plants
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Life cycle of a pea plant
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Cross pollination
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Seven characteristics studied by Mendel
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Example- Round and Wrinkled seeds
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Ratios of Dominant to Recessive in Mendel’s Plants
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Example: Crossing purple flower plants with white flower plants
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Results
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Mendel’s conclusions (law of segregation) n Hereditary factors occur in pairs n One factor may mask or prevent expression of the other (Dominance) n A pair of factors is segregated
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Unformatted text preview: during gamete formation and randomly recombine during fertilization Testcross H H H T (2) T T probability Dihybrid cross Mendels second law PRINCIPLEOF INDEPENDENT ASSORTMENT Members of each pair of traits segregate independently of other pairs during gamete formation. (9:3:3:1 ratios) Incomplete dominance Incomplete dominance Blood antigens Human Blood Types Pedigree chart Male Female Widows peak is a dominant trait Polygenic Inheritance Pleiotropy Attached earlobes is recessive...
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Chapter 14 - during gamete formation and randomly recombine...

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