If nothing disrupts the chromosome replication and separation process, each cell in the body should have the same number of chromosomes that were present in the fertilized egg. However, errors can occur in this replication and separation process. Two mechanisms have been proposed to explain why a child may be born with mosaic Down syndrome. In this way, a second cell grouping was created with only 46 chromosomes. It is also possible that a child with mosaic Down syndrome inherited a total of 46 chromosomes at the time of conception.
Every child is born with a unique set of talents and abilities.
However, it is impossible to predict what these talents and abilities will be. This is true for a child who inherits 46 chromosomes. While it is impossible to tell you what the future holds for your daughter, I can share with you information about other children with mosaic Down syndrome. Studies have shown that individuals with mosaic Down syndrome, on average have IQ scores that are 10-30 points higher than individuals with trisomy 21. Their scores are thought to be higher because the presence of the cells with 46 chromosomes modify the effects of the cells with 47 chromosomes.