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Trisomy 21. Down syndrome (also known by the karyotype 47,XX,+21 for females and 47,XY,+21 for males) [98] is mostly caused by a failure of the 21st chromosome to separate during egg or sperm development, known as nondisjunction. [91] As a result, a sperm or egg cell is produced with an extra copy of chromosome 21; this cell thus has 24 ...
Rather than having monosomy, or only one copy, the majority of aneuploid people have trisomy, or three copies of one chromosome. [citation needed] An example of trisomy in humans is Down syndrome, which is a developmental disorder caused by an extra copy of chromosome 21; the disorder is therefore also called trisomy 21. [7]
Genetics of Down syndrome. Down syndrome is a chromosomal abnormality characterized by the presence of an extra copy of genetic material on chromosome 21, either in whole (trisomy 21) or part (such as due to translocations). The effects of the extra copy varies greatly from individual to individual, depending on the extent of the extra copy ...
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 ...
Birth defects affected about 96 million people as of 2015. [11] In the United States, they occur in about 3% of newborns. [8] They resulted in about 628,000 deaths in 2015, down from 751,000 in 1990. [9] [12] The types with the greatest numbers of deaths are congenital heart disease (303,000), followed by neural tube defects (65,000). [9]
A child with Down syndrome. A prominent example of a genetically determined neurodevelopmental disorder is trisomy 21, also known as Down syndrome. This disorder usually results from an extra chromosome 21, [41] although in uncommon instances it is related to other chromosomal abnormalities such as translocation of the genetic material.
The Ole Miss riot of 1962 was a violent disturbance at the University of Mississippi (commonly called Ole Miss) in Oxford, Mississippi, as segregationist rioters sought to prevent the enrollment of James Meredith, an African-American. In the wake of the Supreme Court 's 1954 decision Brown v. Board of Education, Meredith applied to Ole Miss in ...
A 2009 British study of 137 parents of autistic children found that 28% believe their children met the criteria for a savant skill, defined as a skill or power "at a level that would be unusual even for 'normal' people". [19] As many as 50 cases of sudden or acquired savant syndrome have been reported. [20] [21]