311dChap14b - Genetics: Mendelian Genetics (2) Patterns of...

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Genetics: Mendelian Genetics: Mendelian Genetics (2) Genetics (2) Patterns of Inheritance Patterns of Inheritance
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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
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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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Incomplete dominance Incomplete dominance
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Incomplete dominance Incomplete dominance
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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
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Polygenic Polygenic inheritance inheritance Polygenic inheritance – when alleles at more than one locus contribute to the same trait for example: (1) skin color (2) human height
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Polygenic inheritance Polygenic inheritance
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Environmental Impact Environmental Impact
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This note was uploaded on 05/05/2008 for the course BIO 52010 taught by Professor Zhao during the Fall '07 term at University of Texas at Austin.

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311dChap14b - Genetics: Mendelian Genetics (2) Patterns of...

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