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).
A picture or design made in mosaic; an article decorated in mosaic. Something resembling a mosaic{1}; something made up of different pieces, fitted together by design to form a unified composition. Etymology: F. mosaÃ¯que; cf. Pr. mozaic musec, Sp. & Pg. mosaico, It. mosaico musaico, LGr. , , L. musivum; all fr. Gr. belonging to the Muses.