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

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

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

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

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

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

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

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

10. Bozeman Tutorial http://www.youtube.com/watch?v=Y1P CwxUDTl8

11. Incomplete Dominance - Blend

12. Codominance - Both show

14. Sex-Linked

15. Sex-Linked

16. Multiple Alleles - Blood Type

18. Dihybrid Cross - 2 traits