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Question

How many of the following are Mendelian disorders? Sickle cell anaemia, Haemophilia, Cri-du chat syndrome, Thalassaemia, Down’s syndrome, Colour blindness, Phenylketonuria, Turner’s syndrome

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Explanation

Mendelian disorders follow single-gene inheritance: sickle cell, thalassaemia, phenylketonuria are autosomal recessive; haemophilia and colour blindness are X-linked recessive. Cri-du-chat, Down and Turner are chromosomal aberrations, leaving five Mendelian disorders.

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