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Haemophilia is a sex-linked inheritance ...

Haemophilia is a sex-linked inheritance condition in humans where a simple cut causes non-stop bleeding. Study the pedigree chart showing the inheritance of haemophilia in a family. Give reasons, which explain that haemophilia is sex-linked

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Gene for haemophilia is present on X-chromosome because the heterozygous female for haemophilia may transmit the disease to sons.
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