Which of the following cannot be included in | vedclass

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(D) Mendelian disorders are primarily determined by alteration or mutation in the single gene. Examples include Hemophilia,Cystic fibrosis,Sickle cell

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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 Hemophilia,Cystic fibrosis,Sickle cell anemia,Color blindness,Phenylketonuria,and Thalassemia.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 but a chromosomal disorder.

Which of the following cannot be included in Mendelian disorders?

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