A chromosome is an organized structure of DNA and protein that is found in cells. It is a single piece of coiled DNA containing many genes and redulatory elements. Chromosomes also contain DNA-bound proteins, which serve to package the DNA and control its functions. The word chromosome comes from the Greek word (chroma, color) and (soma, body) due to their property of being very strongly stained by particular dyes.
having extra chromosones is usually more negative than it is positive. our cells are made to check for 23 cells and not 24, thus leading to many problems such as sterility, and with an extra chromosone, down syndrome will occur.
down syndrome is the only trisomy that last more than 2-3 years, other than down syndrome, there are others as well, such as 'Edward's Syndrome', 'Patau Syndrome', and derived fron the different chromosone pairs with an extra.
Edwards syndrome is very rare, only present in one every five-thousand births. the chances increase if the mother is above 30.
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