Identical Twins Hint at How Environments Change Gene Expression


The discussion of nature and nurture is an ongoing focus of twin studies research with epigenetics being the next frontier. Nancy Segal, CSUF professor of psychology and director of the Twin Studies Center, said that “nature and nature work in concert affecting every measurable human trait.”

Similarities and differences in twins offer insights into the effects of genetics and the environment, and twins raised apart offer particularly powerful case studies. In the field of twin studies, there is so much still left to untangle and explore, as the research continues to veer more toward epigenetics and also the human microbiome, noted Segal, who is described as “a walking Wikipedia of twin science.”

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