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Law of Independent Assortment

Mendel & Heredity. Law of Independent Assortment. Law of Independent Assortment. Genes for different traits on the same chromosome are inherited independently from each other Mendel discovered this through his experiments w/dihybrid crosses (2 parents w/2 different traits)

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Law of Independent Assortment

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  1. Mendel & Heredity Law of Independent Assortment

  2. Law of Independent Assortment • Genes for different traits on the same chromosome are inherited independently from each other • Mendel discovered this through his experiments w/dihybrid crosses (2 parents w/2 different traits) • Ex: tall, yellow pea plant with a short, green pea plant

  3. Dihybrid Punnett Square

  4. Dihybrid cross – like a puzzle • Can 2 parents with Heterozygous round, yellow seeds produce offspring with wrinkled, green seeds? • 1st – determine possible gametes/ allele partners • First • Outside • Inside • Last • Set up PSq boxes

  5. Practice Dihybrid Cross • Heterozygous Purple Flower & Homozygous Tall X Homozygous white flower & Heterozygous Tall Key: F purple flower T tall f white flower t short

  6. Environment affects gene expression • Internal - Age, gender (hormonal differences) • Ex: male bird feathers colorful • External - Temperature, nutrition, light, radiation, chemicals, viruses • Ex: genes for height; without proper nutrition…will not be tall

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