Haemophilia is a sex-linked inheritance condition in humans where a si

1.	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. Answer the questions that follow:Give reasons which explain that haemophilia is (i) sex-linked, and (ii) caused by ‘X’-linked gene.
Answer» (i) Haemophilia is sex-linked because it shows transmission from unaffected carrier female to some of the male progeny. (ii) Haemophilia is caused by ‘X’-linked gene because the heterozygous female for haemophilia may transmit the disease to sons.

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. Answer the questions that follow:Give reasons which explain that haemophilia is (i) sex-linked, and (ii) caused by ‘X’-linked gene.

Answer»

(i) Haemophilia is sex-linked because it shows transmission from unaffected carrier female to some of the male progeny.

(ii) Haemophilia is caused by ‘X’-linked gene because the heterozygous female for haemophilia may transmit the disease to sons.

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