Quick Facts: Down Syndrome (Trisomy 21) - Merck Manuals Consumer Version

Down Syndrome (Trisomy 21) - Learn about the causes, symptoms, diagnosis & treatment from the Merck Manuals - Medical Consumer Version.
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Down syndrome (Trisomy 21): Video, Anatomy & Definition

About Down Syndrome National Down Syndrome Society (NDSS)

Trisomy 21 (Down Syndrome) Diagnosis & Expectations

Trisomy 21

Quick Facts: Down Syndrome (Trisomy 21) - Merck Manuals Consumer Version

Quick Facts: Microcephaly - MSD Manual Consumer Version

About Down Syndrome National Down Syndrome Society (NDSS)

DNA LAB - The genetic cause of Down Syndrome is an extra chromosome in chromosome 21. Human cells normally contain 23 pairs of chromosomes. When babies are growing in the womb, they

Trisomy 18 - Children's Health Issues - Merck Manuals Consumer Version

Down syndrome: MedlinePlus Genetics