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).
Webster Dictionary(0.00 / 0 votes)Rate this definition: 1  Mosaic(noun) a surface decoration made by inlaying in patterns small pieces of variously colored glass, stone, or other material; -- called also mosaic work. 2  Mosaic(noun) a picture or design made in mosaic; an article decorated in mosaic.