A normal­visioned man whose father was colour­ blind, marries a woman whose father was also colour­blind. They have their first child as a daughter. What are the chances that this child would be colour­ blind ?

  • [AIPMT 2012]
  • A

    $1$

  • B

    Zero percent

  • C

    $0.25$

  • D

    $0.5$

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