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Exploring Mendelian Genetics

Exploring Mendelian Genetics. Chapter 11 Section 3 SC B-46: Predict inherited traits by using the principles of Mendelian genetics (including segregation, independent assortment, and types of dominance). Essential Question.

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Exploring Mendelian Genetics

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  1. Exploring Mendelian Genetics Chapter 11 Section 3 SC B-46: Predict inherited traits by using the principles of Mendelian genetics (including segregation, independent assortment, and types of dominance)

  2. Essential Question How would you explain the inheritance patterns beyond dominant & recessive?

  3. Dihybrid Crosses Mendel also performed an experiment to follow 2 different genes as they passed from parents to offspring Mendel chose true-breeding round, yellow peas crossed with true-breeding wrinkled, green for F1 (RRYY) x (rryy) What genotype/phenotype will the offspring have?

  4. Mendel’s 2nd Experiment The Inheritance of 2 Traits Does the inheritance of 1 characteristic influence the inheritance of another characteristic? For example: Does pea shape influence pea color?

  5. F1 Generation allowed to self-pollinate

  6. Results: Mendel’s plants produced 556 seeds round & yellow: 315 wrinkled & green: 32 combinations of parent phenotypes: 209 Mendel’s conclusion: Alleles for seed shape & color segregate independently when gametes forming

  7. Law of Independent Assortment Genes from different traits can segregate independently during the formation of gametes. This accounts for the many genetic variations observed in plants, animals, & other organisms

  8. Summary of Mendel’s Principles Inheritance of biological characteristics is determined by individual units called genes. Genes are passed from parents to their offspring. If there are 2 or more alleles of a gene for a single trait, some forms may be dominant & others recessive In most sexually reproducing organisms, each individual has 2 copies of a single gene (1 from each parent) & they separate when gametes are formed Alleles for different genes usually separate independently of one another.

  9. Incomplete Dominance Cases where neither allele is dominant the heterozygous individual will have a phenotype that is a blend of the 2 alleles.

  10. Codominance Both alleles for a gene are expressed in the phenotype of a hybrid individual

  11. Multiple Alleles genes that have >2 alleles

  12. Polygenic Traits Traits controlled by the interactions of several genes

  13. Genetics & the Environment Genes provide a plan for development but how that plan unfolds also depends on the environment

  14. Name that type of inheritance

  15. Name that type of inheritance!

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