Which disorder is caused by autosomal primary | vedclass

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(A) Non-disjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division.Down syndrome is caused by

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Down syndrome

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(A) Non-disjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division.Down syndrome is caused by the presence of an extra copy of chromosome $21$ (trisomy $21$),which occurs due to the non-disjunction of autosomal chromosomes during meiosis.Klinefelter syndrome $(XXY)$ and Turner syndrome $(XO)$ are sex-chromosomal disorders caused by the non-disjunction of sex chromosomes.Sickle cell anemia is an autosomal recessive point mutation,not a chromosomal disorder caused by non-disjunction.Therefore,the correct answer is Down syndrome.

Which disorder is caused by autosomal primary non-disjunction?

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