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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.
The trisomy 21 karyotype figure shows the chromosomal arrangement, with the prominent extra chromosome 21. Trisomy 21 is the cause of approximately 95% of observed Down syndrome, with 88% coming from nondisjunction in the maternal gamete and 8% coming from nondisjunction in the paternal gamete. [4]
Jérôme Jean Louis Marie Lejeune (French pronunciation: [ʒeʁom ʒɑ̃ lwi maʁi ləʒœn]; 13 June 1926 – 3 April 1994) was a French pediatrician and geneticist, best known for his work on the link of diseases to chromosome abnormalities, most especially the link between Down Syndrome and trisomy-21 and cri du chat syndrome, amongst several others, and for his subsequent strong opposition ...
This is a list of people with Down syndrome, a condition also known as Down's syndrome or trisomy 21. Down syndrome is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [1] It is typically associated with developmental delays, characteristic physical features, and mild to moderate intellectual disability ...
In April 1960, the condition was named trisomy 21. As of 1970 the Lejeune foundation started to promote the discovery as primarily the work of Lejeune. [ 10 ] Gautier claimed in 2009 that she was put to one side by Turpin and by Lejeune who claimed responsibility for the discovery, even though it relied on the work that she had initiated and ...
Trisomy 21, one of the three types of Down syndrome, indicates that an individual has a duplicate of chromosome 21. The extra chromosome changes how one’s brain and body develop, and can lead to ...
The most common type of Down syndrome is trisomy 21, which accounts for 95% of all cases. ... Nikola Jokić passes Magic Johnson for 3rd-most triple-doubles in NBA history. Weather. Weather ...
Mattel debuted its first Barbie with Down syndrome, the latest in the toymaker's efforts to create more diverse and inclusive versions of its iconic doll.