There appears to be a tendency for schizophrenia to run in families. This suggests that genes play a role. The closer the genetic relationship the much likely the the great unwashed are to get by the dis wander. Evidence from family studies by Gottesman showed that when both invoke are insane then there is a 46% chance of the tike getting it, however, if only one resurrect had it, it dropped to 16% and dropped to a further 1% when the sibling of the child had schizophrenia. This suggests that a genetic factor is involved. Gottesman too looked at schizophrenics whose make had an identical twin. He found that there was a 17% of being schizophrenic when the father was notwithstanding he also found that there was also 17% chance of evolution the disease when the fathers twin had schizophrenia but the father didnt.
MZ twins share 100% of their genes; DZ twins share 50% of their genes. If genes are a factor we would expect more identical twins to share the disorder than non-identical. Rosenthal took a exemplar study which had a set of female quadruplets. They all genuine schizophrenia although the onset and symptoms were very different. This could have been a impression of having a troubled upbringing. This suggests a strong heritable component.
However, roughly first degree relatives and twins share the same or similar environments so it is difficult to separate genetic and environmental influences. Adoption studies compare people who have been raised in a different environment from their biological relatives. If they have similarities with their biological relatives this should be due to genes. Evidence from adoption studies, such as, Tenaris study that had a longitudinal study of 155 schizophrenic mothers who gave up their children fro adoption. These were compared with 155 adopted children who did not had a schizophrenic mother. Once these children reached adulthood there was a 10.3% chance of developing schizophrenia when...If you want to get a full essay, order it on our website: Orderessay
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