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Down Syndrome
Part 1 of Paper
....acial features. It is also called trisomy 21. occurs when there is an abnormality in chromosome 21. It is found in approximately 1 out of 1000 all live births. Each year, 3,000 to 5,000 people are diagnosed with in the United States.
The formal story began in 1866, when a physician named John Langdon D.... Part 2 of Paper
....y of children with (approximately 95 percent) have an extra 21 chromosome. Instead of the normal number of 46 chromosomes in each cell, the individual with has 47 chromosomes. This condition is called trisomy 21. The second type is called translocation since the extra 21 chromosome is attached or translocated on to another chromosome, usually on chromosome 14, 21 or 22. If translocation is found in a child with , it is important to examine the parents' chromosomes, since in at least one-third .... |
| Number of words: 1633 - Approximate pages: 6 |
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