science
Grade-11
Easy

Question

Which chromosome is affected by hemophilia?

  1. X
  2. Y
  3. 21
  4. 13

hintHint:

This chromosome represents female.

The correct answer is: X


    Hemostasis or blood clotting is a natural phenomenon that occurs in an injured person. Plasma posses clotting factors which are responsible for blood clotting. These clotting factors are 12 in number (I to XII).
    Hemophilia is a rare blood disorder caused due to deficiency of clotting factors VIII or IX. The genes responsible for the production of these clotting factors are present in X chromosome.

    • Hemophilia is a blood disorder
    • Individual with hemophilia does not posses clotting factor VIII or IX
    • The genes for producing clotting factors are present in X chromosome

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