Yes. Based on excellent studies looking at twins who were adopted at birth in certain scandinavian counties, one's risk of developing schizophrenia is about 10% if one parent has schizophrenia. The odds rise to 50% for offspring if both parents have it. By the way, there are good treatments now available for schizophrenia.
Yes amd no. There are some rare disorders such as porphyria that can cause symptoms of psychosis. But, that technically is an "organic psychosis, " not schizophrenia. Others are listed on this website: http://www.Medicalnewstoday.Com/releases/160428.Php that said, genes and gene mutations that may contribute to the risk of schizophrenia that are under active investigation. Read more...