A man with normal vision whose father was colourblind marries with women whose father was also colourblind. Suppose their first child is daughter then what are the chances of this child to be colourblind?

  • A

    $100\, \%$

  • B

    $25 \,\%$

  • C

    $50\, \%$

  • D

    $0 \,\%$

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