CNN: Scientists love to study twins because they help answer age-old questions about nature vs. nurture. Identical twins share the same genes, so any differences between them — say, more wrinkled versus less wrinkled skin — could be the result of their environment. “Studies of human health are plagued by these confounding factors,” Craig said, including when someone was born, where they were born and their socioeconomic status, ethnicity and gender. Often, twins are perfect controls, he said.One of the broadest studies of twins in the United States suggests that our genes tend to influence the diseases that afflict us more than where we live.
according to research published Monday in the journal Nature Genetics.
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