Definition. Sex-linked diseases are passed down through families through one of the X or Y chromosomes. X and Y are sex chromosomes. Dominant inheritance occurs when an abnormal gene from one parent causes disease even though the matching gene from the other parent is normal.The abnormal gene dominates.efinition. Sex-linked diseases are passed down through families through one of the X or Y chromosomes. X and Y are sex chromosomes. Dominant inheritance occurs when an abnormal gene from one parent causes disease even though the matching gene from the other parent is normal.
Savant syndrome is a rare syndrome in which people with poor mental development or brain injury possess extraordinary mental skills which are difficult to explain scientifically. Sometimes the talents of a savant may go unnoticed.he exact cause of a savant syndrome is not known. A lot of hypotheses have been proposed. Some researchers believe that there is damage to the left hemisphere of brain, which results in compensatory changes in the right side of brain.
These skills may be amazing in comparison to the disability of autism.As many as 1 in 10 persons with autism spectrum disorder have such impressive abilities in varying extent, although savant syndrome occurs in other developmental disabilities or in other types of central nervous system injury or disease as well. person with this condition was once known as an 'idiot savant', since 'idiot' was an acceptable word for mental retardation in the late 19th century, when the phenomenon was first medically investigated.