2008 National DNA Day Online Chatroom Transcript

This is just one question from an archive of the National DNA Day Moderated Chat held in April 2008. The NHGRI Director and many genomics experts from across NHGRI took questions from students, teachers and the general public on topics ranging from basic genomic research, to the genetic basis of disease, to ethical questions about genetic privacy.

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If you have too many chromosomes, why do you have down syndrome?      Dale Lea, R.N., M.P.H., C.G.C., F.A.A.N.: Developing genetics, health education and community involvement programs and resources, and translating genetic and genomic information for the public. A person who has Down syndrome has an extra number 21 chromosome. Another name for Down syndrome is trisomy 21. There are other genetic conditions that involve extra or missing chromosomes such as Trisomy 13, Trisomy 18 and Klinefelter syndrome (47,XXY). Flint Northern Academy in MI (12th grade student)

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