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4-Genetics AHL - polygene (by Peter)

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Abbotsford Christian School
Abbotsford Christian School

Polygenic inheritance refers to a characteristic controlled by multiple genes. It results in continuous variations in phenotypes rather than discrete traits. For example, human skin color is determined by the concentration of melanin, which is influenced by four separate genes with different alleles, leading to a wide range of skin tones. Another example of polygenic inheritance producing continuous variation is wheat color, which is influenced by multiple genes.

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Polygenic Inheritance Peter Baek
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.
Define polygenic inheritance. • A single characteristic controlled by multiple genes • polygenic inheritance gives continuous variations in the phenotype
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.
Explain that polygenic inheritance can contribute to continuous variation using two examples, one of which must be human skin colour. • Two alleles Contributing- Add to the phenotype Non-Contributing- do not add to the phenotype If genes are assumed that they are not linked
Continuous Variation in the Phenotype
Continuous Variation • Think of more examples of Continuous Variation
Try it yourself
Ratio
Wheat Color, Eye Color • How many genotypes and phenotype of two genes with two alleles will be possible? • 9!

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4-Genetics AHL - polygene (by Peter)

  • 2. 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.
  • 3. Define polygenic inheritance. • A single characteristic controlled by multiple genes • polygenic inheritance gives continuous variations in the phenotype
  • 4. 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.
  • 5. Explain that polygenic inheritance can contribute to continuous variation using two examples, one of which must be human skin colour. • Two alleles Contributing- Add to the phenotype Non-Contributing- do not add to the phenotype If genes are assumed that they are not linked
  • 6. Continuous Variation in the Phenotype
  • 7. Continuous Variation • Think of more examples of Continuous Variation
  • 10. Wheat Color, Eye Color • How many genotypes and phenotype of two genes with two alleles will be possible? • 9!