Category Archives: Severe Mental Impairment

Please Stop Outsourcing Sign-Making to People With an Extra 21st Chromosome…

“Trisomy 21″ is the scientific name for Down Syndrome.  It means that instead of the normal two, the affected “individual” has three copies of the 21st chromosome. Note the three copies of chromosome 21 in the karyotype pictured above, showing … Continue reading

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