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extra chromosome disorders list :: Article Creator Find Extra Chromosome Our mission is to provide accurate, engaging news of science to the public. That mission has never been more important than it is today. As a nonprofit news organization, we cannot do it without you. Your support enables us to keep our content free and accessible to the next generation of scientists and engineers. Invest in quality science journalism by donating today. What To Know About Down Syndrome Down syndrome is a genetic condition that occurs when an error in cell division results in an extra chromosome 21. It can affect a person's cognitive ability and physical growth, and there may be a higher risk of some health problems. Down syndrome can affect a person's cognitive ability and physical growth, cause varying developmental differences, and present a higher risk of some health problems. Healthcare professionals can use a series of scre...