Apes don’t get schizophrenia. Apes also don’t have culture which is not to to state that there is not some variability in how apes behave in different locales and not to state there is not some use of sticks and rocks to obtain food and most definitely not to state that apes should not be protected. Culture demands use of media.
Why are studies where twin babies are separated at birth required in heritability studies of schizophrenia? Geneticists can’t nail down the genes. Given twin babies separated at birth have similar incidences of schizophrenia then various environmental influences are supposedly ruled out. The take away point is that heritability studies in schizophrenia are not finding genes that confer heritability rather the evidence for environmental effects is ruled out by twin studies where babies are separated at birth so schizophrenia susceptibility must be largely genetic.. The case for the genetic basis of schizophrenia is entirely circumstantial.
Independent assortment occurs where alleles of two different genes get sorted into gametes independently of one another. In research on the genetics of schizophrenia 108 independent genetic loci have been found to be associated with schizophrenia . The 108 genetic loci are not being inherited together. So what does the genetic theory of schizophrenia amount to – ‘Bad stuff happens mysteriously. ‘.
There is a lot of speculation on why only humans can get schizophrenia..Some have argued that schizophrenia represents s a costly trade-off, in the evolution of Homo sapiens, with schizophrenia being a by-product of a yet unknown uniquely human quality. I would not say the quality is a yet unknown quality though I would strongly agree that the quality is uniquely human The quality is culture.
;Schizophrenia is epigenetic in origin. So are various persistences in culture. Education of course, matters too in terms of persistencen of culture . The case for the genetic basis of schizophrenia is unfounded. Differences in genetic makeups can not explain various persistences in culture. Various persistences in human cultures and heritability of schizophrenia are both to due to transgenerational epigenetic inheritance.