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Principles of Inheritance and Variation
Sex-linked inheritance - haemophilia
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- Sex-linked inheritance - haemophilia
All Questions
2022 Phase 2 1 question
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A normal girl, whose mother is haemophilic marries a male with no ancestral history of haemophilia. What will be the possible phenotypes of the offsprings? (a) Haemophilic son and haemophilic daughter. (b) Haemophilic son and carrier daughter. (c) Normal daughter and normal son. (d) Normal son and haemophilic daughter. Choose the most appropriate answer from the options given below:Haemophilia is X-linked recessive. The girl receives $X^h$ from her mother, so she is a carrier ($X^hX$). Crossing $X^hX \times XY$ gives carrier daughter ($X^hX$), haemophilic son ($X^hY$), normal daughter ($XX$) and normal son ($XY$). So (b) and (c) are possible.