Twin studies offer a critical method to studying questions of nature and nurture in addiction research. Identical twins arise from the same fertilized egg, so they share 100 percent of their genes. If a trait is entirely genetic, identical twins strongly resemble one another in that trait. Think of hair color, eye color, height. Fraternal twins, on the other hand—people born from the same mother at the same time, but formed from separate eggs—share just 50 percent of their genes, ...
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5
NOV
2013
NOV
2013
0
