As children, identical twins are indistinguishable. But as they reach adulthood, physical differences develop: One twin may go gray earlier or the other's facial features may seem more youthful. The video "The Epigenetics of Identical Twins" uses a low tech approach to explain that one reason for this phenomenon is epigenetics, the chemical changes cells make to chromosomes.
Credit: Genetic Science Learning Center, University of Utah
Harmony Starr, Molly Malone and Brendan Nicholson
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