NEET 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: (B)
Solution
The man receives his X chromosome only from his mother, so his colour-blind father has no bearing on his own genotype; as a stated normal-visioned man, his genotype is . The woman's father was colour blind (), so she necessarily received an from him, making her an obligate carrier, .
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