What happens when you have one more chromosome 2024?
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Works at the International Development Association, Lives in Washington, D.C., USA.
Most fetuses with trisomy are miscarried during the first trimester. Most of those who survive have Down syndrome, also known as trisomy 21 because it's caused by an extra chromosome 21. While all babies with Down syndrome have some degree of mental impairment, it's severe in only about 10 percent.
2023-04-21 18:06:08
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Julian Hill
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Most fetuses with trisomy are miscarried during the first trimester. Most of those who survive have Down syndrome, also known as trisomy 21 because it's caused by an extra chromosome 21. While all babies with Down syndrome have some degree of mental impairment, it's severe in only about 10 percent.