What causes Trisomy 17 mosaicism ?
What causes trisomy 17 mosaicism? Trisomy 17 mosaicism can arise due to errors in cell division that occur after conception. For example, at the time of conception, the fetus may actually have trisomy 17 in all of its cells; however, during cell division, some of the cells lose the extra chromosome 17. Alternatively, the fetus may initially have had only two copies of chromosome 17, but due to errors in cell division some of the cells end up with an extra copy of chromosome 17. Either of these two scenarios result in trisomy 17 mosaicism. To read more about trisomy mosaicism, visit the following links from the Medical Genetics Department at the University of British Columbia in Canada. What is mosaicism?  How does trisomy mosaicism occur?