Down syndrome is due to an extra copy of chromosome 21. Why do people with Down syndrome have 47 chromosomes instead of the usual 46?

People with Down syndrome have 47 chromosomes because of a condition called trisomy 21, where an individual inherits an extra chromosome 21. This leads to a total of 47 chromosomes instead of the typical 46. This extra genetic material results in the developmental and physical traits associated with Down syndrome.

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