Evaluate the expression. 
Definitions:
Trisomy
Chromosome condition in which a diploid cell has one more chromosome than normal; designated as 2n + 1.
Extra Copy
In genetics, refers to an additional copy of a gene or chromosome segment, potentially leading to variations in traits or disease susceptibility.
Chromosome
A structure within cells that contains genetic information in the form of DNA, essential for the control of cell activities and inheritance.
Trisomy 21
A genetic disorder caused by the presence of an extra 21st chromosome, also known as Down syndrome.
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