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Some studies look at identical twins vs fraternal twins, seeing if identical twins are more similar than fraternal. It's an excellent way to control for almost
by waterhouse 4y ago
Some studies look at identical twins vs fraternal twins, seeing if identical twins are more similar than fraternal. It's an excellent way to control for almost everything except the genetics.
- cperciva 4y agoThe gold standard is "separated twins" studies, looking at identical twins who are adopted away to different families at birth. Sadly for science but happily for the families involved, these are getting harder to do; the primary source of such twins used to be unmarried women who became pregnant, but between the availability of birth control and a dramatic reduction in the social stigma, far fewer children are being "hidden" by being adopted away.