Down syndrome DS or DNS , also known as trisomy 21 , is a genetic disorder caused by the presence of all or part of a third copy of chromosome The parents of the affected individual are typically genetically normal. There is no cure for Down syndrome. Down syndrome is one of the most common chromosome abnormalities in humans.
In , Dr. John Langdon Down noted that some of his patients shared a combination of distinct physical features, medical issues, and cognitive impairments. Tying these similarities together, Down concluded that his patients had a specific syndrome.
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Yuchen Zhang said: Thank you, Laci. You give me hope that this country isn't a complete waste of space.. Down syndrome is a condition in which a person has an extra chromosome. Downs syndrome facial characteristics.