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

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Presentation transcript:

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

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

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

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

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

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

Alleles IAIA Dominant IBIB iRecessive

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

 Blood Protein  Rh+ Dominant  Rh - Recessive

 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.