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The average IQ of a young adult with Down syndrome is 50, similar to the mental age of an 8 or 9 year old child. Down syndrome can be identified during pregnancy by prenatal screening followed by diagnostic testing or after birth by direct observation and genetic testing. The genetic cause of Down syndrome, an extra copy of chromosome 21, was identified by French researchers in 1959.
- Author
- VenkataKrishna Gadde
- Language
- EN