OK lets start with the schizophrenia one
Taken from the NHS websigte as it happens ( or do you think the NHS is so rubbish now they dont know their science?).
"Genetics account for almost 80 per cent of a person's risk of developing schizophrenia, according to new research," the Mail Online reports. That is the main finding of a study looking at how often schizophrenia affected both twins of a pair, looking at identical and non-identical twins"
The study was carried out by researchers from the Center for Neuropsychiatric Schizophrenia Research at Copenhagen University Hospital in Denmark. Funding was provided by the Lundbeck Foundation Center of Excellence for Clinical Intervention and Neuropsychiatric Schizophrenia Research, and Lundbeck Foundation Initiative for Integrative Psychiatric Research.
The study was published in the peer-reviewed journal Biological Psychiatry, and is available to read for free online.
When I went to University in 1975, one of the first debates we looked at was nature and nurture. Even back then the 80% genes figure was being quoted and backed up by what was then fairly primitive research. It was believed then that this 80% figure was general across most things, not just mental illness. When I went back to university in 1989 the same figures were being used with different research.
Today I read the same 80/20 ideas with more modern research.