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Question

Non - disjunction in meiosis results in:

A
Trisomy
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B
Normal diploid
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C
Gene mutation
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D
None
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Solution

The correct option is A Trisomy
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. It is the leading cause of pregnancy wastage and is the most common known cause of mental retardation.

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