NEET 2012 Biology 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 ?
Answer: (3)
Solution
Colour blindness is X-linked recessive. The man has normal vision, so his genotype is (his X came from his mother, his Y from his colour-blind father). The woman's father was colour-blind (), so she must have received from him: she is either a carrier or colour-blind
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