Instead, they discovered that if one fraternal, or dizygotic, twin developed schizophrenia, the other twin had a 17% chance of developing it as well. This is significantly lower than the 48% for identical twins.
Schizophrenia is a serious mental disorder in which people have an abnormal interpretation of reality.
Schizophrenia can cause hallucinations, delusions, and extremely disordered thinking and behavior that interferes with daily functioning and can be disabling. Schizophrenia patients must be treated for the rest of their lives.
Deletions or duplications of genetic material in any of several chromosomes are also thought to increase the risk of schizophrenia.
A small deletion (microdeletion) on chromosome 22 called 22q11, in particular, may be involved in a small percentage of cases of schizophrenia.
Thus, this is the likelihood of a person developing schizophrenia if the disorder affects his or her fraternal twin.
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