Keep in mind that schizophrenia is also influenced by the amount of stress a child experiences in early childhood. I'm an identical twin and our early experiences differed significantly as one became the dominant one as well as more outgoing than the other--such being my twin (Jean--get it, Jean and Joan). That all changed after we moved and I was then able to establish my own identify without constantly being compared to my twin--the pervasive annoyance experience by for identical twins. I'm sure many of you have heard of the Genain quadruplets who all became schizophrenic, no doubt partly due to having an alcoholic father who terrorized, spied on and sexually molested the girls. All four became schizophrenic before age 25 (Rosenthal &Quinn, 1977). The fact that some of the sisters are more disturbed that others suggests that environmental conditions also affect mental illness. The sisters were followed for over 60 years and, not surprisingly, the sister who was able to avoid her father, Myra, was the least ill of the four (Mirsky, 2000).
Joan [EMAIL PROTECTED] > Chris- > > This certainly seems interesting and could help explain a lot of > puzzling differences that we sometime see in "identical" (e.g. one > develops schizophrenia and one does not, one ends up gay and the other > straight etc.) Since this is not my field I'm not completely sure how to > interpret these findings. From the article I was unable to determine the > ages of the subjects. Given that several of the pairs had Parkinson's I > am assuming that they were adults & probably post 50. Would we expect > these same differences to occur in neonate twins? That is, are these > differences something that arises out of misreplications over a lifetime > or were they there since conception. Hopefully someone with a greater > knowledge of genetics than mine (and that would be almost anybody) could > help clarify this point. > > Thanks, > > -Don. > > [EMAIL PROTECTED] wrote: > >>Have you been teaching your students that identical (monozygotic) twins >> have >>identical genes? Turns out that's not correct. See this NYT article: >> >>http://tinyurl.com/33m4c3 >> >>Chris Green >>York U. >>Toronto, Canada >>[EMAIL PROTECTED] >> >>--- >>To make changes to your subscription contact: >> >>Bill Southerly ([EMAIL PROTECTED]) >> >> > > -- > Don Allen > Department of Psychology > Langara College > Vancouver, B.C., Canada > V5Y 2Z6 > > 604-323-5871 > > > --- > To make changes to your subscription contact: > > Bill Southerly ([EMAIL PROTECTED]) > > --- To make changes to your subscription contact: Bill Southerly ([EMAIL PROTECTED])
