Mendelian Genetics part 2 - Genetics: Mendelian Genetics:...

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1 Genetics: Genetics: Mendelian Mendelian Genetics (2) Genetics (2) Patterns of Inheritance Patterns of Inheritance Outline 6. Extending Medelian Genetics a. Incomplete Dominance b. Codominance c. Polygenic Inheritance d. Environmental Impact 7. Mendilian Inheritance in Humans 8. Key Terms 9. Conclusions Incomplete dominance Incomplete dominance Incomplete dominance – heterozygous phenotype is intermediate between two parents for example, snapdragons: P: Red x White (RR x R’R’) F1:Pink (RR’) F2: ¼ Red(RR), 2/4 Pink(RR’), ¼ White(R’R’)
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2 Incomplete dominance Incomplete dominance Incomplete dominance Incomplete dominance Codominance Codominance Human Blood types The gene located on chromosome 9 Three alleles I A , I B , i (4 types: A, B, AB, O) Based on markers on red blood cells [Blood Type] 1. A ( I A I A , I A i) anti B antibodies 2. B ( I B I B , I B i) anti A antibodies 3. AB ( I A I B ) none 4. O (ii) anti A and anti B antibodies
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Polygenic Polygenic inheritance inheritance Polygenic inheritance – when alleles at more than one locus contribute to
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This note was uploaded on 02/16/2010 for the course BIO 49970 taught by Professor Chinnery during the Spring '10 term at University of Texas at Austin.

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Mendelian Genetics part 2 - Genetics: Mendelian Genetics:...

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