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Haemophilia this is a disease that affects the rate of clotting of blood, leading to excessive bleeding even from a minor cut. Haemophilia is more common in males than in females.

A female my have the gene for haemophilia and not show the trait because the normal gene is dominant over the gene for haemophilia.Such females are referred to as carriers.

If the carrier female offspring will be carriers while the other half will be normal. Half the males will be normal and the other heamophilic.

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