Question

A disease caused by an autosomal primary non-disjunction is *

A) Down's syndrome
B) Klnerfelter's syndrome
C) Turner's syndrome
D) Sickle-cell anemia
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Answer 1

Answer:

Down's syndrome

Explanation:

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Answer 2

Answer:

Down syndrome (trisomy 21)

Explanation :

Down syndrome, a trisomy of chromosome 21, is the most common anomaly of chromosome number in humans. The majority of cases results from nondisjunction during maternal meiosis I. Trisomy occurs in at least 0.3% of newborns and in nearly 25% of spontaneous abortions.