Fraternal adult insane twins

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Social Science. As MZ twins share all their genetic information, everything that is genetically encoded should be the same in each twin regardless of whether the twins share the same environment. In DZ twins there should only be similarities that would occur with any siblings Hollin, Twins who have not shared the same environment offer researchers a valuable opportunity to contrast genetic variation and environmental differences. Environment would be shown as the major influence if the child is more like their adopted parents Hollin, Both twin and adoption studies are used to describe concordance alikeness and variance, of heritability.
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Twin - Wikipedia

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Twins and Adoption their Effects on Criminal Behavior

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So you perhaps thought that twins could be either identical or fraternal? But did you know that there are actually other types of twins besides these two mentioned? Of course, identical and fraternal twins are the ones we are more aware of because they are the ones we hear about most and are most likely to encounter. The chances of having identical twins are of around 3 in every births. When it comes to fraternal twins the chances are higher and are in fact around double.
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