If an individual is a mosaic for a chromosome aneuploidy, what likely inference

In some cases, a change in the number of chromosomes occurs only in certain cells.  When an individual has two or more cell populations with a different chromosomal makeup, this situation is called chromosomal mosaicism (illustration).  Chromosomal mosaicism occurs from an error in cell division in cells other than eggs and sperm. Most commonly, some cells end up with one extra or missing chromosome (for a total of 45 or 47 chromosomes per cell), while other cells have the usual 46 chromosomes. Mosaic Turner syndrome is one example of chromosomal mosaicism.  In females with this condition, some cells have 45 chromosomes because they are missing one copy of the X chromosome, while other cells have the usual number of chromosomes.



When an individual has two or more cell populations with a different chromosomal makeup, this situation is called chromosomal mosaicism.