chromosomal mosaicism

What Happens If You Have An Extra Chromosome?

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What Happens If You Have An Extra Chromosome? For example, an extra copy of chromosome 21 causes Down syndrome (trisomy 21). Chromosomal abnormalities can also cause miscarriage, disease, or problems in growth or development. The most common type of chromosomal abnormality is known as aneuploidy, an abnormal chromosome number due to an extra or missing

What Causes Extra Copies Of Chromosomes?

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What Causes Extra Copies Of Chromosomes? The addition of an extra chromosome usually occurs spontaneously during conception. The cause of this is unknown and prevention is not possible. The most important risk factor for trisomy conditions is maternal age. Women in their late 30s and 40s have a higher chance of trisomy conditions occurring. Why