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Not completely. Research has indicated that while many people carry genes associated with a high possibility of manifesting schizophrenia symptoms, many people never develop any noticeable signs of the illness. Among those who do show signs do so in varying degrees- in other words, some cases are very serious, and others are less disruptive to the person. Some research has indicated that a stable, low-stress life can prevent these genes from activating or "switching on".

Other research has shown that stress and traumatic experiences can trigger schizophrenia symptoms at higher rates. There is much evidence for the "environmental" theories about schizophrenia- that something outside the person can influence the genes, essentially "switching them on". Stressful experience such as abuse during childhood, traumatic events such as car accidents, drug use (particularly psychotropic, hallucinogenic, or stimulant drugs) can trigger schizophrenia symptoms to be "expressed".

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Q: Is schizophrenia determined by genetics
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