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Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation1 Mark
MCQ
The disease, sickle-cell anaemia, is caused by:
  • A
    Malarial infection
  • B
    Iron deficiency
  • C
    Poor hygiene
  • D
    None of the above
✓

Answer

  1. None of the above

Explanation:

Sickle cell anaemia is caused by a genetic mutation that affects the normal development of haemoglobin. A genetic mutation is a permanent change in the normal pattern of genetic information inside all living cells. Abnormal haemoglobin, called haemoglobin S, causes sickle cell disease (SCD). When the haemoglobin S gene is inherited from only one parent and a normal haemoglobin gene is inherited from the other, a person will have sickle cell trait.

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