Multiple choice

The mutation in the haemoglobin gene causes _________________.

  1. phenylketonuri

  2. cystic fibrosis

  3. sickle-cell disease

  4. Tay–Sachs disease

  5. haemophilia

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sickle-cell disease is a hereditary blood disorder, characterized by red blood cells that assume an abnormal, rigid sickle shape. Sickling decreases the cells' flexibility and results in a risk of various life-threatening complications. This sickling occurs because of a mutation in the haemoglobin gene.