A normal woman, whose father was colour-blind is married to a normal man. The sons would be

  • [AIPMT 2004]
  • A

    All normal

  • B

    All colour-blind

  • C

    $75\%$ colour-blind

  • D

    $50\%$ colour-blind

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Female rarely experience the physiologic defect of haemophilia because they do so only when they are

What is the cause of haemophilia

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Given below is a pedigree chart of a family with five children. It shows the inheritance of attached earlobes as opposed to the free ones. The squares represent the male individuals and circles the female individuals Which one of the following conclusions drawn is correct

  • [AIIMS 2004]

Haemophilia $A$ is due to the absence of