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Genetics – Life’s Blueprint

Genetics – Life’s Blueprint. The Theory of Blended Traits Why wasn’t it a good theory?. Before Mendel. Mendel and his Peas. The Seven Traits Flower Color purple vs white Flower placement axial vs terminal Seed Color yellow vs green Seed Shape round vs wrinkled Pod Shape

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Genetics – Life’s Blueprint

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  1. Genetics – Life’s Blueprint

  2. The Theory of Blended Traits Why wasn’t it a good theory? Before Mendel

  3. Mendel and his Peas • The Seven Traits • Flower Color • purple vs white • Flower placement • axial vs terminal • Seed Color • yellow vs green • Seed Shape • round vs wrinkled • Pod Shape • plump vs wavy • Pod Color • green vs yellow • Stem Length • tall vs dwarf 1822 - 1884

  4. Mendel First Cross

  5. Observation - There is more than one version of a trait. (Each version is called an allele) • Law – • Each organism inherits two alleles, one from each parent • One allele “dominates” when present • The other allele “recedes” when the dominant allele is present Mendel’s First Law – the Law of Segregation

  6. Mendel First Cross

  7. Punnet Squares

  8. Punnet Squares

  9. Punnet Squares – Test Cross

  10. Given the parents’ genotypes what are the offsprings’ possible phenotypes and ratios? • Given the parents’ phenotypes and the offsprings phenotypic ratios, what are the parents’ genotypes? Simple Mendelian Problems

  11. Observation – When two traits are followed, they don’t always stay together • Law – • Each pair of alleles segregates independently of • the other pairs of alleles during gamete formation Mendel’s Second Law – the Law of Independent Assortment

  12. Punnet Squares – Two Traits

  13. Punnet Squares – Two Traits

  14. Punnet Squares – Two Traits

  15. Phenotypic Probabilities

  16. Given the parents’ genotypes what are the offsprings’ possible phenotypes and ratios? • Given the parents’ phenotypes and the offsprings phenotypic ratios, what are the parents’ genotypes? Multiple Trait Problems

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