4-genetics ahl - polygene (by peter)
TRANSCRIPT
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Polygenic Inheritance
Peter Baek
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Assessment Statements
• 10.3.1• Define polygenic inheritance.• 10.3.2• Explain that polygenic inheritance can
contribute to continuous variation using two examples, one of which must be human skin colour.
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Define polygenic inheritance.
• A single characteristic controlled by multiple genes
• polygenic inheritance gives continuous variations in the phenotype
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Explain that polygenic inheritance can contribute to continuous variation using two examples, one of which must be human skin
colour.
• - Skin color is determined by the concentration of melanin. The darker the skin the greater protection from the sun.
• Skin color is controlled by four separate genes each with different alleles.
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Explain that polygenic inheritance can contribute to continuous variation using two examples, one of which must be human skin
colour.
• Two allelesContributing- Add to the phenotypeNon-Contributing- do not add to the phenotypeIf genes are assumed that they are not linked
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Continuous Variation in the Phenotype
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Continuous Variation
• Think of more examples of Continuous Variation
•
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Try it yourself
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Ratio
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Wheat Color, Eye Color
• How many genotypes and phenotype of two genes with two alleles will be possible?
• 9!