The condition in which there are too many or few copies of one of the chromosomes is termed as

Aneuploidy

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Polytene

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Polyploidy

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Monoploidy

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Solution

The correct option is D Aneuploidy
The condition in which there are too many or few copies of one of the chromosomes is termed as aneuploidy. In aneuploidy, any change in the number of chromosomes in an organism would be different than the multiple of the basic set of chromosomes. It commonly arises due to nondisjunction (absence of separation of two homologous chromosomes during cell division ) of the two chromosomes of the homologous pair so that one gamete comes to have an extra chromosome (n+1) while the other become deficient in one chromosomes (n-1).
Examples of aneuploidy:
Trisomy: Down's syndrome, Klinefelter's syndrome
Monosomy: Turner's syndrome

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