Alternative numbers connecting you to the same Sky helpline include: 0800 151 0775 â This is a freephone number. Calls to this number are completely free and donât consume time from your free minutes allowance. 0843 504 7160 â This is a âlo-call rateâ service number.
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.
Down Syndrome is the most well known disease caused by chromosomal abnormalities. In this disorder there is a third copy of chromosome 21 (there are two copies of each chromosome in the cells of healthy humans). Chromosomal diseases can be also caused by segments and joins of parts of chromosomes.