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.
Children who display savant syndrome have traditionally been referred to as idiot, retarded, or autistic savants. The negative connotations of the term idiot have led to the disuse of idiot savant. Because the syndrome is often associated with autism, the term autistic savant is more frequently heard.pproximately 10 percent of all children with autism have savant syndrome. The rate increases to 25 percent of children with autism who have an IQ over 35. (Many autistic children have lower IQs.) About three times as many boys as girls have savant syndrome.