1. Genetics and Heredity Part III Every path has its puddle. English proverb

2. Today’s Agenda Dihybrid crosses Incomplete dominance Codominance Polygenic

3. Dihybrid SetUp PpSs X PpSs

4. PS

5. Dihybrid SetUp PpSs X PpSs PSPs

6. Dihybrid SetUp PpSs X PpSs PSPs pS

7. Dihybrid SetUp PpSs X PpSs PSPs pS ps

8. Dihybrid SetUp PpSs X PpSs PSPs pS ps PS Ps pS ps

9. Dihybrid SetUp PpSs X PpSs PPSS PSPs pS ps PS Ps pS ps

10. Dihybrid SetUp PpSs X PpSs PPSSPPSs PSPs pS ps PS Ps pS ps

11. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSS PSPs pS ps PS Ps pS ps

12. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PSPs pS ps PS Ps pS ps

13. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSs PSPs pS ps PS Ps pS ps

14. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPss PSPs pS ps PS Ps pS ps

15. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSs PSPs pS ps PS Ps pS ps

16. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PSPs pS ps PS Ps pS ps

17. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSS PSPs pS ps PS Ps pS ps

18. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSs PSPs pS ps PS Ps pS ps

19. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSS PSPs pS ps PS Ps pS ps

20. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PSPs pS ps PS Ps pS ps

21. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSs PSPs pS ps PS Ps pS ps

22. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpss PSPs pS ps PS Ps pS ps

23. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSs PSPs pS ps PS Ps pS ps

24. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSsppss PSPs pS ps PS Ps pS ps

25. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSsppss PSPs pS ps PS Ps pS ps

26. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSsppss PSPs pS ps PS Ps pS ps

27. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSsppss PSPs pS ps PS Ps pS ps

28. Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSsppss PSPs pS ps PS Ps pS ps

29. 9:3:3:1 PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSsppss PSPs pS ps PS Ps pS ps

30. Obj. 9 Incomplete Dominance Definition: A condition in which a trait in an individual is intermediate between the phenotype of the two parents because the dominant allele is unable to express itself fully.

31. Example of Incomplete Dominance: Red snapdragon X white snapdragon All offspring are pink snapdragons

32. Codominance Definition: a condition in which both alleles for a gene are fully expressed. Ex. Blood Types

33. Polygenic Definition: a characterisitc of an organisms that is determined by many genes Ex. Eye color, height, weight

34. Multiple Alleles Genes with three or more alleles Example: Blood groups A = AO, AA B = BO, BB AB = AB O = OO

35. Practice Problems