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Hair color is a human trait controlled by 7 genes with a Heritability of 1. Based...

Hair color is a human trait controlled by 7 genes with a Heritability of 1. Based on this, provide a 1-2 sentence explanation of the correct classification for what type of trait hair color is and how the information provided supports that classification (single-gene trait, polygenic trait, multifactorial polygenic trait, environmentally controlled trait).

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Answer #1

We are provided with two information:

  1. The trait is controlled by 7 different genes.
  2. The heritability of trait is 1.

Based of this information, the hair color trait in humans is polygenic. This is because it is influenced by more than one gene, and heritability of 1 means that any variations observed in hair color is solely due to genetic reasons. (Thus, environmental factors have no role to play, and this fact eliminates the option of hair color being a multi-factorial trait.)

The correct classification of hair color: Polygenic trait.

(kindly upvote, if the answer is helpful).

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