Trisomy 21 (Down syndrome), Trisomy 18 (Edwards syndrome), and Trisomy 13 (Patau syndrome) are the most prevalent autosomal trisomy types in people who survive to delivery.
With the exception of the Y chromosome, chromosome 21 has the fewest projected protein-coding sequences of any human chromosome, making trisomy 21 the only viable autosomal trisomy. The most prevalent types of trisomy are Down syndrome, Edward syndrome, and Patau syndrome. Trisomy frequently results in a variety of birth defects in children, including intellectual impairments and delayed development. If you have an additional set of a chromosome, trisomy diseases develop. When one duplicate of a chromosome is absent, you have monosomy.
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