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Question
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?
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?
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Solution
The correct option is D Zero percent
Color blindness is an X-linked recessive disorder, which affects males more often than females, as they contain a single X chromosome.
When a colour blind man marries a normal woman, then all his sons are unaffected, whereas his daughters although unaffected are carriers of the mutated gene (see the diagram below).
When a carrier woman marries a normal man, as seen in the figure below, only 50% of their sons get affected by the disorder, whereas none of their daughters are affected.
Hence, for this question, the answer is there is no chance for the child to be colour blind.
Color blindness is an X-linked recessive disorder, which affects males more often than females, as they contain a single X chromosome.
When a colour blind man marries a normal woman, then all his sons are unaffected, whereas his daughters although unaffected are carriers of the mutated gene (see the diagram below).
When a carrier woman marries a normal man, as seen in the figure below, only 50% of their sons get affected by the disorder, whereas none of their daughters are affected.
Hence, for this question, the answer is there is no chance for the child to be colour blind.
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