Down Syndrome

A genetic chromosome 21 disorder causing developmental and intellectual delays.
Down syndrome is a genetic disorder caused when abnormal cell division results in extra genetic material from chromosome 21.
Down syndrome causes a distinct facial appearance, intellectual disability, developmental delays, and may be associated with thyroid or heart disease.
Medical specialists will conduct additional screenings. Early intervention programs with a team of therapists and special educators who can treat each child’s specific situation are helpful in managing Down syndrome.


Cluster Number:
Wiki Number: W069
Diagnosis: Down Syndrome
US Patients: 1 in 1000 babies
World Patients: 5 Mil
Sex Ratio:
Age Onset: Ave IQ-50
Brain Area: Also know as Trisomy 21 due to a third set of genes.
Symptoms: Ages 8-9 maximum mental development.
Progression: probability of a Down-born child increases with the age of the parents.
Causes: 3rd copy of Chromosome 21
Medications: None listed.
Therapies: Support and education

Youtube Video: Down Syndrome Journey

Amazon or Library Book:

Mental Wellness in Adults with Down Syndrome

Amazon or Library Book:

Up, Not Down Syndrome

Click the book to link or buy through Amazon.

Click the book to link or buy from Amazon.

Support Group:; 800-221-4602

(National Down Syndrome Society)


The world-wide medical research
reports chosen for each diagnosis 

Clicking each title opens the
PubMed article’s summary-abstract.