Which one of the following is a chromosomal d | vedclass

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(D) Chromosomal disorders are caused by the absence or excess or abnormal arrangement of one or more chromosomes.$A$. Sickle cell anaemia is a Mendeli

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Turner syndrome

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(D) Chromosomal disorders are caused by the absence or excess or abnormal arrangement of one or more chromosomes.$A$. Sickle cell anaemia is a Mendelian disorder caused by a point mutation in the gene for haemoglobin.$B$. Phenylketonuria is a Mendelian disorder caused by an autosomal recessive gene mutation.$C$. Colorblindness is a sex-linked recessive Mendelian disorder.$D$. Turner syndrome is a chromosomal disorder caused by the absence of one of the $X$ chromosomes in females,resulting in a $45, XO$ genotype.

Which one of the following is a chromosomal disorder?

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