| Haemophilia | Sickle-cell Anaemia |
|---|---|
| $(1)$ It occurs due to a defective recessive allele present on the $X$-chromosome. | $(1)$ It occurs due to point mutation,i.e.,a single base pair change leads to a change in amino acid. |
| $(2)$ The defective allele produces a non-functional protein involved in the blood clotting cascade. | $(2)$ In this,glutamic acid $(Glu)$ is replaced by valine $(Val)$ at the sixth position of the beta-globin chain of the haemoglobin molecule. |
| $(3)$ It is a sex-linked recessive disorder. | $(3)$ It is an autosomal-linked recessive disorder. |
| $(4)$ More males are affected than females. | $(4)$ Both males and females are affected equally. |
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