According to question, extraversion are not likely to be influenced by their shared environment .
Fraternal twins and identical twins have been shown to be very similar. Numerous twin studies have now discovered that genetic impact accounts for roughly half (40–60%) of the variance in all personality variables between people.
Modern twin studies have found that nearly all traits are influenced to some extent by genetic differences, with some traits showing a stronger influence (such as height), others an intermediate level (such as personality traits), and some more complex heritabilities, with evidence for different genes affecting different.
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