PSYC 332 Lecture Notes - Lecture 5: Meta-Analysis, Birth Order, Personality Psychology
13 Nov 2017
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The similarities in personality between siblings is less than the similarities in look, sound and movement. Identical twins (mz) share 100: adoption studies, adopted siblings share 0 genes no genetic influence, biological siblings share 50, combined adoption/twin studies. In how they look and in their personalities. Identical twins: correlations on the b5t for mz are higher than the correlations for dz, fraternal twins are not as similar, major studies comparing extroversion in mz and dz twins. In every single country, the mz are more similar on e than the dz: approximately 50% heritability. Wrong: swedish twin study, had dz and mz raised together vs raised, dz together, r = 0. 19, dz apart, r = 0. 14, mz together, r = 0. 52, mz apart, r = 0. 49. It looks like locus of control is largely determined by the shared environment a(cid:374)d there"s al(cid:373)ost (cid:374)o ge(cid:374)eti(cid:272) i(cid:374)flue(cid:374)(cid:272)e.
