2005 National DNA Day Online Chatroom Transcript
This is just one question from an archive of the National DNA Day Moderated Chat held in April 2005. 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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Do identical twins have the exact same DNA structure??
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Don Hadley, M.S., C.G.C.: Identical twins share the exact same DNA at the time of conception. However, changes can occur after conception which can make their DNA differ. Likewise, even though their DNA starts out the same, exposures to the "environment" (harsh chemicals, for example) can change their risks for diseases to occur. So in the end, even identical twins can have minor differences in their DNA. |
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