Dr. Segal has found that identical twins were the most alike in their thinking, fraternal twins somewhat less so, and virtual twins strikingly different. When it comes to intelligence, for example, her research has found that only 25 percent of the differences between twins — virtual, fraternal or identical — can be accounted for by their environment, 75 percent by genetics.
Of course there will always be brilliant children born to dim parents, and dim children born to brilliant parents. But it is nice thinking that Makayla has the odds stacked in her favor.
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