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A normal-visioned man whose father was colour-blind, marries a woman whose father was also colour-blind. They have their first child as a daughter. What are the chances that this child would be colour-blind ? (1) 50% (2) 100% (3) Zero percent (4) 25%

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A normal-visioned man whose father was colour-blind, marries a woman whose father was also
colour-blind. They have their first child as a daughter. What are the chances that this child would be
colour-blind ?
(1) 50% (2) 100% (3) Zero percent (4) 25%
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(3) Zero percent
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