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Haemophilia is caused by an X-linked recessive gene. Two parents with the normal phenotype have a haemophiliac child. Use a genetic diagram to show how this is possible. (4 marks) (X"= = normal; X¹ =gene for haemophilia)​

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Since it is a recessive gene this means both parents must be carriers for a child to show the trait meaning both parents will be X X1.
User Ruelos Joel
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