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Down syndrome may also occur in hominids other than humans. In great apes chromosome 22 corresponds to the human chromosome 21 [a] and thus trisomy 22 causes Down syndrome in apes. The condition was observed in a common chimpanzee in 1969 and a Bornean orangutan in 1979, but neither lived very long. The common chimpanzee Kanako (born around ...
This is the cause of 1–2% of the observed Down syndromes. [4] There is evidence that mosaic Down syndrome may produce less developmental delay, on average, than full trisomy 21. [8] The following diagram shows two possible mechanisms leading to mosaic trisomy 21.
Down syndrome is a genetic disorder that often results in distinct physical differences and intellectual disability. According to the Centers for Disease Control, each year about 6,000 babies are ...
Robertsonian translocation ( ROB) is a chromosomal abnormality where the entire long arms of two different chromosomes become fused to each other. It is the most common form of chromosomal translocation in humans, affecting 1 out of every 1,000 babies born. [ 1] It does not usually cause medical problems, though some people may produce gametes ...
A guide to Down syndrome including symptoms and diagnosis of this genetic condition.
Down syndrome research. Research of Down syndrome–related genes is based on studying the genes located on chromosome 21. In general, this leads to an overexpression of the genes. [1] [2] Understanding the genes involved may help to target medical treatment to individuals with Down syndrome. It is estimated that chromosome 21 contains 200 to ...
A fossilized ear bone unearthed in a cave in Spain has revealed a Neanderthal child who lived with Down syndrome until the age of 6, according to a new study. The find suggested that members of ...
Research has found that there is a correlation between advanced paternal age and risk of birth defects such as limb anomalies, syndromes involving multiple systems, and Down syndrome. [74] [35] [93] Recent studies have concluded that 5-9% of Down syndrome cases are due to paternal effects, but these findings are controversial. [74] [75] [35] [94]