Mental disability due to transmission of abnormal genetic characteristics leads to metabolic disorder in the cells of the body .. Damage in brain cells and nervous system

The child may become mentally disabled not only because his parents are mentally disabled, but because of the transmission of abnormal genetic characteristics, lead to metabolic disorders in the body's cells, resulting in damage to brain and nervous system cells leading to mental disability. In the past year, there are two types of abnormal genetic characteristics:
Chromosomal abnormalities.
Gene abnormalities. (Dr.Marsi 1996).
We will address each of them separately and the symptoms associated with them and how they occur.