Trisomy results in affecting an entire chromosome, not just a gene or base pair, i.e., option C is correct.
The presence of three chromosomes rather than the usual pair of chromosomes is referred to as trisomy.
Trisomy 21, also known as Down syndrome, occurs when a baby has three 21st chromosomes.
Trisomy results in affecting an entire chromosome, not just a gene or base pair.
Thus, the correct option is C.
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