Research To Date Has Shown: 1  ADHD is a neurobiologic condition whose symptoms are also dependent on the child's environment. 2  A lower level of activity in the parts of the brain that control attention and activity level may be associated with ADHD. 3  ADHD frequently runs in families.
Mosaic (genetics) In genetics, a mosaic (or mosaicism) means the presence of two different genotypes in an individual which developed from a single fertilized egg. As a result, the individual has two or more genetically different cell lines derived from a single zygote. Unusual events in cell division (mitosis).
Mosaicism is a condition where an individualâs cells are genetically variegated. Also known as Gonadal or chromosomal mosaicism, this condition is congenital and can affect any type of cell. Resulting from erroneous cell division while in utero, treatment is dependent upon the type of genetic condition.