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NEET2016ZoologyPrinciples of Inheritance and VariationActual

Which of the following most appropriately describes haemophilia?

Options

  1. ARecessive gene disorder
  2. BX - linked recessive gene disorder
  3. CChromosomal disorder
  4. DDominant gene disorder

Correct answer

B. X - linked recessive gene disorder

Step-by-step solution

Genes related to haemophilia are always present on the X-chromosome, and it is a recessive gene disorder as it expresses itself in females when it comes to a homozygous condition. It causes a defect in the clotting factor formation; thus, a simple cut can bleed continuously leading to even death. Hence, it is also known as 'bleeders' disease or 'royal disease' as Queen Victoria was a carrier for this disease.

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