Which is not a Mendelian disorder in man?

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(D) Mendelian disorders are primarily determined by alteration or mutation in the single gene. Examples include Haemophilia,Colour blindness,Sickle ce

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Down's syndrome

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(D) Mendelian disorders are primarily determined by alteration or mutation in the single gene. Examples include Haemophilia,Colour blindness,Sickle cell anaemia,Phenylketonuria,Thalassemia,and Cystic fibrosis.Down's syndrome is a chromosomal disorder caused by the presence of an additional copy of chromosome number $21$ (Trisomy of $21$).Therefore,Down's syndrome is not a Mendelian disorder.

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