Lecture 4 posted - Punnett Squares(genotype(phenotype...

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BIO 311D LECTURE 4 GENETICS 1/24/07
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Blending inheritance model Large population of 20mph bunnies
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Add one 30mph bunny
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+ If blending inheritance happens… 30mph bunny 20mph bunny = 25mph bunnies
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Next generation… + 25mph bunny 20mph bunny = 22.5mph bunnies
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After 11 generations… 20.003mph bunnies + =
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Gregor Mendel Gregor Mendel Lived 1823-1884 Performed well in school To continue studies, entered Augustinian monastery and became a monk. Became an excellent botanist (plant biologist) Became interested in how inheritance worked Performed new experiments from 1857-1865 to deduce principles of inheritance in pea plants.
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Mendel’s experiments Mendel’s experiments Generation time. Heritable characteristics. Number of offspring produced. Performance of crosses. Captivity Cost animation
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Mendels peas
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S w S w S w S w w w S S S = smooth seed w = wrinkled seed
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Unformatted text preview: Punnett Squares (genotype) (phenotype) Generations: – Parent - S = smooth seed, w = wrinkled seed Generations: – Parent - S = smooth seed, w = wrinkled seed S w S w S w S w w w S S-- F1 Punnett square Generations: – Parent - S = smooth seed, w = wrinkled seed SS S w S w ww S w S w S w S w S w S w w w S S F1 F2 What does it mean about inheritance? Two particulate “factors” Equal likelihood of passing on Equal contribution 3 1 1 2 1 Phenotype Purple Purple Purple White Genotype PP (homozygous) Pp (heterozygous) Pp (heterozygous) pp (homozygous) Ratio 3:1 Ratio 1:2:1 Mendel’s First Law: Law of Equal Segregation Mendel’s two factor cross Where does 9:3:3:1 come from? Mendel’s Second Law: Law of Independent Assortment Mendel’s Laws...
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Lecture 4 posted - Punnett Squares(genotype(phenotype...

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