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Down syndrome or Down's syndrome, [12] also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [3] It is usually associated with developmental delays, mild to moderate intellectual disability , and characteristic physical features.
Mosaic Down syndrome: Only some cells in the person have an extra copy of chromosome 21. This genetic cause is considered rare. This genetic cause is considered rare.
The second, combined with a normal gamete from the other parent, gives rise to a typical child. The third leads to a translocation Down syndrome child. The last becomes a translocation carrier, like the parent. Translocation Down syndrome is often referred to as familial Down syndrome. It is the cause of about 4.5% of the observed Down ...
The average IQ of a young adult with Down syndrome is 50, equivalent to the mental age of an 8- or 9-year-old child, but this number varies widely. [3] At the same time, they enjoy a rich social and emotional awareness. [4] Down syndrome is the most common chromosome abnormality in humans, [3] occurring in about one per 1000 babies born each ...
A woman's age is a key factor in whether or not her child as at risk for Down syndrome, according to the National Down Syndrome Society. While the chances are 1 in 1,200 for a woman who gets ...
“When your child is born with Down syndrome everyone tells you what they can’t do and how tough it is going to be. … Chris is going to prove if he can do an Ironman and he can do anything ...
Research has found that there is a correlation between advanced paternal age and risk of birth defects such as limb anomalies, syndromes involving multiple systems, and Down syndrome. [74] [35] [93] Recent studies have concluded that 5-9% of Down syndrome cases are due to paternal effects, but these findings are controversial. [74] [75] [35] [94]
Their first child, a boy they name Paul, is born a healthy perfect child, but when the second baby is born, Phoebe, David notices she has Down syndrome. David, recalling the possibility of a heart defect and early death (which his younger sister June had had, dying at the young age of 12) and decides that the baby girl will be placed in an ...