Multiple choice

In humans, certain specific diseases are caused by point mutations. Which among the following diseases is associated with HEXA gene being present on chromosome 15?

  1. Color blindness

  2. Tay–Sachs disease

  3. Sickle-cell anemia

  4. Neurofibromatosis

  5. Cystic fibrosis
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B Correct answer
Explanation

The cause of Tay–Sachs disease is a genetic defect that is passed from parent to child. This genetic defect is located in the HEXA gene, which is found on chromosome 15. The HEXA gene makes part of an enzyme called beta-hexosaminidase A, which plays a critical role in the nervous system.

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