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NEETZoologyPrinciples of Inheritance and Variation

What is an example of a polygenic trait mentioned in the paragraph?

Options

  1. AFlower color in pea plants
  2. BSkin color in humans
  3. CHeight in plants
  4. DEye color in animals

Correct answer

B. Skin color in humans

Step-by-step solution

In a polygenic trait the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive. To understand this better let us assume that three genes A, B, C control skin color in humans with the dominant forms A, B and C responsible for dark skin color and the recessive forms a, b and c for light skin color. The genotype with all the dominant alleles (AABBCC) will have the darkest skin color and that with all the recessive alleles (aabbcc) will have the lightest skin color. As expected

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