2011 Lect 13 Extensions of Mendelian genetics

2011 Lect 13 Extensions of Mendelian genetics -...

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Extensions of Mendelian genetics 1
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So far–complete dominance Parents: smooth x wrinkled (both sexes) SS x ss Smooth Offspring: all smooth generation ( F1 generation ) Ss Smooth 2
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Flower color in snapdragons Parents: smooth x wrinkled (both sexes) SS x ss Ss 3
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Flower color in snapdragons Evidence for blending hypothesis? How can we test this? 4
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Flower color in snapdragons Parents: smooth x wrinkled (both sexes) SS x ss Evidence for blending Ss hypothesis? How can we test this? No support for blending 5 hypothesis
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Flower color in snapdragons Parents: smooth x wrinkled (both sexes) Incomplete dominance: Phenotype is SS x ss intermediate between those of the two homozygous parents Ss 6
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odominance blood types Codominance : blood types Type A Type B Type AB Type O Types A and B show codominance : both show up phenotype in phenotype and B are ominant O A and B are dominant to O 7
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Blood groups show both dominance and codominance Type O is homozygous recessive: I o I o A or B dominant to O Type A: I A I A or I A I o Type B: I B I B or I B I o A and B codominant to each other Type AB: I A I B 8
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How do blood types work? A and B place different antigens on blood cells Body’s antibodies attack them if you don’t normally have them O: no antigen (null condition) Example: lood type A produces Blood type A produces antigens of type A on the surface of blood cells. antibodies against blood cells of type B 9
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How do blood types work? 10
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How do blood types work? 11
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How do blood types work?
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2011 Lect 13 Extensions of Mendelian genetics -...

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