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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.
In honor of Down Syndrome Awareness Month, which happens every October, we rounded up some informative facts about the chromosomal condition.
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.
Peutz–Jeghers syndrome, dark patches on the lips etc. Piebaldism, patchy absence of melanin-producing cells; Vitiligo, a skin condition which causes areas of the skin to lose its colour; Xanthochromism, an unusual yellow colouration in animals; Zelandoperla fenestrata, a stonefly exhibiting a Batesian mimicry melanic polymorphism
The skin was dry and hard and seemed to be cracked in many places, somewhat resembling the scales of a fish. The mouth was large and round and open. It had no external nose, but two holes where the nose should have been.
This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. "Skin pigmentation" redirects here. For animal skin pigmentation, see Biological pigment. Extended Coloured family from South Africa showing some spectrum of human skin coloration Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among ...
Down syndrome is the most common genetic condition in the U.S. Approximately 400,000 Americans have Down syndrome. Here are amazing individuals with Down syndrome who are breaking the barriers of ...
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 ...