One child is haemophilic (sex-linked trait), while its fraternal twin – McqOptions

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1.	One child is haemophilic (sex-linked trait), while its fraternal twin 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 haemophilic.
D.	The haemophilic child is a male.
Answer» B. The child is a monozygotic twin.

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