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08/10/2021 7:55 pm
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One child is haemophilic (sex-linked trait), while its fraternal twin brother is normal. Which one of the following information is most appropriate?
(1) The other child is a female and the father is haemophilic
(2) The mother must have been heterozygous
(3) The haemophilic child is a male
(4) The child is a monozygotic twin
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08/10/2021 7:57 pm
Correct answer: (2) The mother must have been heterozygous