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Mitotic nondisjunction after conception would lead to mosaicism, and is discussed later. Some cases have been reported of people with Down syndrome having children with trisomy 21. [5] In these cases (all from mothers), the ovaries were trisomy 21, leading to a secondary nondisjunction during gametogenesis and a gamete with an extra chromosome 21.
In most cases, Down syndrome is not inherited. 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 ...
Lindsey Wiggins tells PEOPLE she had some inklings that her daughter might have Down syndrome, but "broke down" when a doctor suggested tests at 4 months old Mom in Tears After 4-Month-Old Is ...
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 ...
46,XX/46,XY chimeric or mosaic is associated with a wide spectrum of different physical presentations, with cases ranging from having a completely normal male or female phenotype [7] [8] [9] to some cases having ovotesticular syndrome. Due to this variation, genetic testing is the only way to reliably make a diagnosis.
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.
The consensus on whether certain prenatal spontaneous mutations and genetic disorders that occur as a result of meiotic and chromosome errors [11] or during cell division after conception, like cystic fibrosis and Down syndrome, are considered to be acquired or inherited [12] is unclear.
Here’s what to know about the different types of Down syndrome tests and their effectiveness. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 ...