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One child is haemophilic (sex-linked tra...

One child is haemophilic (sex-linked trait), while its fraternal twins brother is normal. Which one of the following informations is most appropriate?

A

The mother must have been heterozygous.

B

The child is a monozygotic twin.

C

The other child is a female and the father is haemophiliac.

D

The haemophiliacchild is a male.

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