Question : (a) Why is haemophilia generally observed in human males ? Explain the conditions under which a human female can be haemophilic. (b) Draw the male Reproductive system.

Question : (a) Why is haemophilia generally observed in human males ?

1.	Question : (a) Why is haemophilia generally observed in human males ? Explain the conditions under which a human female can be haemophilic. (b) Draw the male Reproductive system.
Answer» Solution :(a) Haemophilia is caused DUE to the recessive GENE on X-chromosome. Y has no ailele for this. If a male is` X^hY`, then he ishaemophilic. If male inherits Xh from the mother, he Will be haemophilic (with the genotype `X^hY`) If female inherits `X^hX`", one from the carrier mother and one from her haemophilic féther, then she can be haemophilic (B) For diagram please SEE Q. No. 29. (a).