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The mother was likely a carrier of the haemophilia gene (XhX), leading to one twin inheriting the normal X chromosome while the other received the X chromosome with the haemophilia gene. Which statement(s) is/are accurate?

1. The mother was probably a carrier of the haemophilia gene (XhX).
2. One twin likely inherited the normal X chromosome from the mother.
3. The other twin probably inherited the X chromosome with the haemophilia gene.
4. All of the above statements are correct.

Correct answer: All of the above statements are correct.

Solution

All the statements collectively explain the inheritance pattern of haemophilia, where the mother is a carrier and the twins inherit different X chromosomes.

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