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Although the probability increases with maternal age, 70% of children with Down syndrome are born to women 35 years of age and younger, because younger people have more children. [4] The father's older age is also a risk factor in women older than 35, but not in women younger than 35, and may partly explain the increase in risk as women age.
Translocation Down syndrome can be passed from parent to child, but this is rare. In these cases, the parent may have extra genetic material from chromosome 21 but no signs of Down syndrome ...
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 child with Down syndrome. A prominent example of a genetically determined neurodevelopmental disorder is trisomy 21, also known as Down syndrome. This disorder usually results from an extra chromosome 21, [41] although in uncommon instances it is related to other chromosomal abnormalities such as translocation of the genetic material.
With October being Down Syndrome Awareness Month, the timing could not be more perfect.
For Ashley Zambelli, a surprise diagnosis allowed her to have an even more special bond with her children.. The Michigan-based mom, 23, recently found out she has Mosaic Down syndrome, a condition ...
Based on maternal age, some countries offer invasive testing to women over 35; others to the oldest 5% of pregnant women. [6] Most women, especially those with a low chance of having a child with Down syndrome, may wish to avoid the risk to the fetus and the discomfort of invasive testing.