Given below is a highly simplified representation of the human sex chromosomes from a karyotype. The gene $'a'$ and $'b'$ could be of

1296-237

  • A

    Colour blindness and body height

  • B

    Attached ear lobe and rhesus blood group

  • C

    Haemophilia and red-green colourblindness

  • D

    Phenylketonuria and haemophilia

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Column $-I$ Column $-II$
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$b.$ Horizontal line between symbols $(ii)$ Offspring
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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 ?

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Haemophilia is