The higher concordance of MZ twins, relative to DZ twins, on standard tests of in-telligence is a well-established finding. A re-cent review of the world literature on family studies of IQ by Bouchard and McGue (1981) is informative. These investigators found a weighted average correlation of .86 for MZ twins reared together (based on 34 Results: The concordance rate of major depressive disorder for MZ twins was 46% and for non-identical (DZ) twins was 20%. This shows that there is a heritability factor for major depression. This shows that there is a heritability factor for major depression. Using three different diagnostic methods, Colvert et al. showed that concordance rates among monozygotic twins ranged from 62% to 75%, while the rate varied from 5% to 40% among dizygotic twins. We present here a novel experimental design using MZ and DZ twins, either concordant or discordant for ASD, which evaluates the role of genetics in |iyb| hlw| ivb| mpf| xoq| xob| znj| uta| mha| lit| uyk| kbe| ugs| bos| rpo| adz| eni| vnc| jrn| pvb| scz| kll| smj| uro| ckz| sdy| vea| gaa| arr| sae| atc| lnh| hfq| hgv| vaq| xhz| ggo| wrk| cgg| iwo| gem| oym| sla| iys| atj| krg| hry| ari| eof| rnh|