Give scientific reasons : The human male never passes on the gene for haemophilia to his son.
Give scientific reasons : The human male never passes on the gene for haemophilia to his son.
The gene for haemophilia is present on $X$-chromosome. $A$ male has only one $X$-chromosome which he receives from his mother and $Y$-chromosome from father. The human male passes the $\mathrm{X}$ chromosome to his daughters but not to the male progeny (son).
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