<prompt> The following feature is not common in 22q 11.2 deletion syndromeMental retardationSchizophreniaADHDCongenital heart defects  <response>: Ans. a Mental retardationRef: Robbins 9thpg 163Individuals with the 22qll.2 deletion syndrome have high risk for psychotic illnesses, such as schizophrenia 25 cases and bipolar disorders.In addition, attention deficit hyperactivity disorder is seen in 30-35 of affected children. 