Down+Syndrome

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 * __Down Syndrome__**

People who have Down Syndrome are born with part of or a complete extra 21st chromosome. Instead of two, three copies of the 21st chromosome are present in each cell. This [|chromosomal abnormality] happens when a nondisjunction occurs in a sperm or eggs that is in the process of being produced. In the nondisjunction, a copied pair of the 21 chromosome is not separated and is therefore put into the same gamete, instead of one. If that one particular gamete gets fertilized, then the 21st chromosome copy is paired up with a normal, single, chromosome gamete and you end up with and embryo filled with 3 copies of the 21st chromosome, instead of 2. This is called a trisomy. Sometimes, an embryo with three copies of a chromosome is destroyed, but other times, it is allowed to prosper. This trisomy 21 is the reason behind an individual with down syndrome.

You may not be overjoyed when you find out that Down Syndrome (DS) is a [|relatively common disease]. It occurs once in every 800 to 1,000 births all around the world. The older the mother is, the higher the risk of the baby having DS. Luckily, the disease is not hereditary, but there is a type of Down Syndrome that __can__ be inherited. It is known as Translocation Down Syndrome. A DS-free person can carry shuffled genetic material between chromosome 21 and another. This shuffling is called a balanced translocation because there is no extra material from the 21st chromosome. This is the only type of Down Syndrome that has a risk of being passed down through inheritance; regular Down Syndrome and Mosaic Down Syndrome cannot.

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**~*~*~*JORDAN, SORRY, I FORGOT TO TALK TO U IN CLASS: ON THE PAPER, I WILL DO THE FIRST 2 QUESTIONS, CAN YOU PLZ DO #3 & #4? JUST IN CASE YOU DONT HAVE THE PAPER, YOUR 2 QUESTIONS ARE: wHAT ARE THE SYMPTOMS OF THE DISORDER? &&&& wHAT THERAPIES OR SOLUTIONS ARE AVAILABLE TO HELP PEOPLE WITH THIS DISORDER?** ~*~*~*~****