Polygenic Traits

By Erik Griffen

Polygenic Trait Info

  • Inheritance pattern for a trait that is controlled by two or more genes
  • Many traits are influenced by the environment
  • Individuals can be completely dominant or recessive for the alleles
  • Hair color, eyes, height, and skin color are affected by polygenetics
  • The phenotypic ratios are not shown like in a regular phenotypes

Blonde Hair

  • Much of the blonde population originates from Scandinavia. The "mutation" was then passed to future generations.
  • Dark skies and limited sunlight over time caused hair and eyes to become pale over time
  • This lighter shade of hair allowed humans in northern climates to synthesize vitamin D more efficiently
  • The gene for blonde hair is homozygous recessive in humans
Light hair, light eyes.


Comment Stream