Down syndrome affects all it is caused by the presence of all or part of a third copy of chromosome twenty one so the individual has forty seven chromosomes . In 1959 french geneticist jerome lejeune recognized that individuals with down syndrome have forty seven chromosomes instead of the usual forty six later it was determined that it is an extra copy of chromosome 21 that causes the condition. Downs syndrome downs syndrome is a genetic condition involving an extra chromosome this change occurs around the time of conception a person with downs syndrome has forty seven chromosomes instead of the usual forty six. Affected me referred to as forty seven how down syndrome has affected me with a lot of bogus forty seven how down syndrome has affected me reviews shared on the internet plenty of customers find it very difficult locating trustworthy info while checking yahoo for where to. Forty seven instead of forty six chromosomes in down syndrome there are three not two copies of the number 21 chromosome resulting in the medical diagnosis of trisomy 21
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