A chromosome (one of the microscopically visible
carriers of the genetic material DNA) with its centromere (the "waist" of the chromosome)
located quite near one end of the chromosome. The "acro-" in acrocentric comes from
the Greek "akron" meaning "the end." Humans have 5 pairs of acrocentric chromosomes.
Down syndrome (trisomy 21) is due to an extra acrocentric chromosome, namely chromosome
21.
A chromosome with a centromere near one end. Down syndrome (trisomy 21) is due
to an extra acrocentric chromosome.
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