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Mendel’s Laws of Heredity

Mendel’s Laws of Heredity. Why we look the way we look. Mendel used peas. They reproduce sexually They have two distinct, male and female , sex cells called gametes Their traits are easy to isolate. Mendel crossed them. Fertilization - the uniting of male and female gametes

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Mendel’s Laws of Heredity

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  1. Mendel’s Laws of Heredity Why we look the way we look...

  2. Mendel used peas... • They reproduce sexually • They have two distinct, male and female, sex cells called gametes • Their traits are easy to isolate

  3. Mendel crossed them • Fertilization - the uniting of male and female gametes • Cross - combining gametes from parents with different traits

  4. What Did Mendel Find? • He discovered different laws and rules that explain factors affecting heredity.

  5. Rule of Dominance • The trait that is observed in the offspring is the dominant trait (uppercase) • The trait that disappears in the offspring is the recessive trait (lowercase)

  6. Law of Segregation • Genes appear in pairs on homologous chromosomes • SEPARATED when gametes are formed • Recombine during fertilization

  7. Law of Independent Assortment • The genes for different traits are inherited independently of each other. • Homologous chromosomes move randomly to gametes • Explains why siblings look different

  8. Monohybrid Vs Dihybrid • Monohybrid Cross - crossing parents who differ in only one trait (AA with aa) • Dihybrid Cross - crossing parents who differ in two traits (AAEE with aaee)

  9. Bozeman Tutorial http://www.youtube.com/watch?v=Y1PCwxUDTl8

  10. Incomplete Dominance - Blend

  11. Codominance - Both show

  12. Sex-Linked

  13. Sex-Linked

  14. Multiple Alleles - Blood Type

  15. Multiple Alleles - Blood Type

  16. Dihybrid Cross - 2 traits

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