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Down Syndrome
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is a combination of birth defects including some degree of mental retardation and characteristic facial 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 ar ....
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.... in a child with , it is important to examine the parents' chromosomes, since in at least one-third of the cases, a parent may be a carrier of the translocation. This form of chromosome error is found in 3 - 4 percent of the individuals with . Another chromosome problem, called mosaicism, is noted in about 1 percent of individuals with . In this case, some cells have 47 chromosomes and others have 46 chromosomes. Mosaicism is thought to be the result of an error in cell division soon after conce.... |
| Number of words: 1633 |
Approximate pages: 6 |
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