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NEETZoologyPrinciples of Inheritance and Variation

What is the phenotype of the genotype AABBCC according to the paragraph?

Options

  1. AIntermediate skin color
  2. BDarkest skin color
  3. CLightest skin color
  4. DNot determined

Correct answer

B. Darkest skin color

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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