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).
Mosaic is the art of creating images with an assemblage of small pieces of colored glass, stone, or other materials. The earliest known examples of mosaics made of different materials were found at a temple building in Ubaid, Mesopotamia, and are dated to the second half of 3nd millennium BCE.