1. QUESTIONS: Is the disorder recessive or dominant? Are the parents homozygous or heterozygous? Infer what the parents genotypes are?

3.  The heterozygous phenotype is an intermediate between the two homozygous phenotypes. RR rr Rr

4.  Both alleles are expressed in the heterozygote.  Checkered Chickens

5.  Some traits are determined by multiple alleles.  Human Blood Types

6.  One gene hides the effect of other genes. E_ B_ E_ bb ee bb eeB_

7.  Determined by multiple pairs of genes.  Skin color  Height  Eye color AaBbCcDd AABBCCDD aabbccdd

8. Alleles IAIA Dominant IBIB iRecessive

9. Blood Type GenotypeAntigenAntibodies AI A I A i AB BIBIBIBiIBIBIBi BA ABI A I B A and B None OiiNoneA and B

10.  Blood Protein  Rh+ Dominant  Rh - Recessive

11.  Determine the genotypes of the parents if the father is blood type A, the mother is blood type B, the three offspring's blood types are O, AB and B.