Trisomy 21 (Down syndrome) is the only example of an autosomal trisomy in which the fetus develops to term and is born alive.

Name: Trisomy 21 (Down syndrome) is the only example of an autosomal trisomy in which the fetus develops to term and is born alive.
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Other autosomal trisomies such as Trisomy 18 (Edwards syndrome) and Trisomy 13 (Patau syndrome) can also result in live births, although individuals with these conditions often have severe medical complications and a significantly reduced lifespan.

Trisomy 21 (Down Syndrome) Is the Only Example of an Autosomal