A husband and wife have normal vision but fathers of both of them were colour blind. Probability of their first daughter to be colour blind is

  • [AIPMT 1990]
  • A

    $25\%$

  • B

    $50\%$

  • C

    $75\%$

  • D

    $0\%$

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  • [NEET 2013]

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  • [AIPMT 2006]