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Which of the following best defines nondisjunction?

ARepetitive replications of the same piece of a chromosome
BComplete exchange of chromosome pieces
CLoss of a piece of a chromosome
DFailure of chromosome pairs to separate

Verified Answer :

the answer is D. Failure of chromosome pairs to separate

Nondisjunction is a condition when sister chromosomes fail to separate proprly during cell division, leaving them with extra cromossom

Nondisjunction is the main cause of genetic abnormality which make an individual suffer from a down syndrome ( causing an intellectual impairment)

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