Which of these is not a Mendelian disorder?

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(D) Mendelian disorders are primarily determined by alteration or mutation in a single gene. Examples include cystic fibrosis,sickle-cell anaemia,colo

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Turner's syndrome

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(D) Mendelian disorders are primarily determined by alteration or mutation in a single gene. Examples include cystic fibrosis,sickle-cell anaemia,colour blindness,and haemophilia.Turner's syndrome is a chromosomal disorder caused by the absence of one of the $X$ chromosomes,resulting in a $45$ $(44 + XO)$ genotype.Therefore,Turner's syndrome is not a Mendelian disorder but a chromosomal one.

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