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).
Mosaics can be described as the art of decorating a surface with designs made up of small, closely placed pieces of hard material, or tesserae. Tesserae glass material, known by the Italian name smalti, is opaque and brilliant in color and can be manufactured in hundreds of hues.