A controversial study on twins claims to provide strong evidence that genetic inheritance has a bigger impact on exam success than schooling and parenting.
It turns out that nature trumps nurture. After analyzing the GCSE results of 5474 pairs of twins – 2008 of them identical – the team found that genes accounted for 52 per cent of the differences between exam scores. A shared upbringing accounted for only 36 per cent of the differences, with the remainder accounted for by environmental factors that weren’t shared, such as each twin having a different teacher.
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