science
Grade-10
Easy

Question

Which of these is an example of inherited variation only?

  1. Eye color 
  2. Height 
  3. Weight 
  4. Skin color

hintHint:

Trait is an example of discontinuous variation.

The correct answer is: Eye color


    Eye color is due to the amount of melanin pigment production. Initially, brown color was considered dominant and blue color was considered recessive. Hence, it was believed that parents with  blue eye color produced offspring with blue colored eyes. Later, this hypothesis was proved wrong.
    The melanin production for eye is controlled by OCR2 gene present in chromosome 15. The expression of this gene is controlled by HERC2 gene. Increased expression of ORC2 gene produces melanin and the progeny will have brown eyes. Decreased expression of the gene due to inhibitory action of HERC2 gene reduces melanin production, thereby progeny has blue eyes.
    The genes responsible for the production of melanin is inherited from the parents. Hence, the eye color is an inherited trait.

    • Eye color is due to the expression of 2 genes: ORC2 and HERC2
    • Increased and decreased expression of the genes produce brown eyed and blue eyed offspring, respectively

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