Down syndrome is the result of an additional 21st chromosome also known as trisomy 21. "Scientist have discovered three types of Down syndrome nondisjunction, or containing three copies of the 21st chromosome; mosaicism occurs when nondisjunction of the 21st chromosome occurs after fertilization, and translocation, occurs when part of the 21st chromosome breaks off and attaches itself to another chrom

In today's world, those with Down syndrome usually live up to and past the age of 50. When in the 1920's their life expectancy was only up to the age of 9. Even though people with Down syndrome are living longer, age also has its own consequences. The most common affects are premature aging, memory loss, and impaired judgment similar to that of Alzheimer's disease.

osome" (Patterson ). Translocation only happens in about 3 to 4 percent of all Down syndrome cases.

Though these three types of Down syndrome seem to be different, they all have similar results. People with Down syndrome are usually diagnosed right after birth. The first diagnosis is based upon the physical appearance on the newborn baby. "Newborn babies with down syndrome all share common traits such as a flat

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