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11.2 More complicated genetics

Explore the complexities of genetics, from Mendel's laws to polygenic traits controlling multifaceted phenotypes like human hair and eye color. Learn about traits' independence, dominance, and gene interactions. Are alleles truly independent? Can gene types affect one another? Find out with examples and explanations.

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11.2 More complicated genetics

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  1. 11.2 More complicated genetics

  2. Question: Are different traits (alleles) joined somehow? • Ex) does shape of seed allele affect seed color allele?

  3. F1 generation = all heterozygous both traits

  4. F2 generation

  5. Mendel discovered independent assortment - genes for different traits segregate independently during gamete formation. • Traits are not “linked”

  6. 11.3 Beyond Dominance • Incomplete Dominance - heterozygous offspring is in between D and R phenotype

  7. Co-dominance - phenotypes of D and R are both clearly expressed

  8. Incomplete dominance or co-dominance?

  9. Punnett squares look the same for co- and incomplete dominance

  10. Multiple Alleles - a gene with more than two alleles (ordered most > least dominant) • Ex) human blood type

  11. Polygenic traits - some phenotypes are controlled by 2 or more different genes • Also called gene interaction • Ex) human hair, eye, skin color

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