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MHT CET Medical202624 April 2026Evening ShiftBiologyPrinciples of Inheritance and VariationActual

The genes located on homologous regions of X and Y chromosomes do not inherit together because crossing over occurs in this region. Thus, they exhibit incomplete sex linkage. They are called the X-Y linked traits. Which of the following is NOT an example of X-Y linked traits?

Options

  1. ATotal colour blindess.
  2. BNephritis.
  3. CMyopia.
  4. DRetinitis pigmentosa.

Correct answer

C. Myopia.

Step-by-step solution

Genes located on the homologous regions of X and Y chromosomes are known as incompletely sex-linked genes or X-Y linked genes. Because crossing over can occur in these homologous regions, these traits do not always inherit together. Common examples of X-Y linked traits in humans include total colour blindness, nephritis, retinitis pigmentosa, xeroderma pigmentosum, and epidermolysis bullosa. Myopia is not an X-Y linked trait. It is generally inherited as an autosomal or X-linked trait. Answer: Myopia.

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