What causes trisomy?
Usually , Trisomy 18 and 13 are caused by spontaneous genetic mutations, that are  occur at the time of fertilization. Normally, The union of these cells creates 23 pairs, or 46 total chromosomes , each egg and sperm cell contains 23 chromosomes. half from the mother and half from the father.

What is the oldest living person with Trisomy 18? 

On  next September 10, Donnie Heaton will celebrate his 28 Birthday. But unlike...  

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