| Column $I$ | Column $II$ |
|---|---|
| $(a)$ Sickle cell anaemia | $(x)$ Homogentisic acid |
| $(b)$ Alkaptonuria | $(y)$ Melanin pigments are absent |
| $(c)$ Albinism | $(z)$ More amount of phenylalanine |
| $(d)$ Phenylketonuria | $(w)$ Defective haemoglobin |
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