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From what is known about the causes of Down syndrome, environmental factors and parents' behavioral activity do not seem to play a role. The causes of Down syndrome are genetic problems related to chromosome 21. While Down syndrome is genetic in that it involves an extra chromosome 21, it is not usually hereditary in the conventional sense.
Who Discovered Down Syndrome. Down syndrome is a chromosomal disorder that produces a set of mental and physical symptoms. It is caused by an extra copy of chromosome 21. In a person with Down syndrome there are three copies of the chromosome 21, one from the father, one from the mother and a third copy.The extra copy of this chromosome changes the development of the brain and body.Down syndrome affects about 1 in every 800 babies.r Down could not identify what caused the condition and it was not until 1959 that a Professor named Jerome JÃ©rome lejeune discovered That down syndrome was caused by a chromosomal. Irregularity he found that in people With down syndrome an extra chromosome was. present