polygenic traits

polygenic traits - More Genetics Topics Gene Interaction...

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More Genetics Topics Gene Interaction Polygenic Inheritance Pleiotropy Linkage
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Examples of Human Quantitative Characters 1. Height 2. Eye Color 3. Intelligence 4. Skin Color 5. Many forms of behavior The early view that blue is a simple recessive has been repeatedly shown to be wrong by observation of brown-eyed offspring of 2 blue-eyed parents. Quantitative vs. Discrete Characteristics Explanation: POLYGENIC INHERITANCE - several genes are influencing the trait.
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Simplified Model for Polygenic Inheritance (It is probably more complex than this) Each dominant gene contributes one “unit” For three genes (A, B, C) there is a range of 0 to 6 units. range of aabbcc (0) to AABBCC (6) aaBbCC (3 units) would be the same phenotype as AABbcc (3 units) for example.
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Gametes: 2 3 = 8 possible arrangements 64 squares
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0 1 2 3 4 5 6
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What is the probability of producing a light skin phenotype (0 units) from a medium individual (3 units) and a light individual (0 units) from each of these couples? 1. AaBbCc
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polygenic traits - More Genetics Topics Gene Interaction...

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