These mice were genetically identical, so any differences in methylation had to come from epigenetic factors. Global DNA study identifies 175,000+ variants affecting human diversity and disease risk ...

Decades after a brutal rape, a groundbreaking technique has finally exposed the attacker, solving a puzzle that once stumped investigators: how to tell identical twins apart using only DNA. The 1987 ...

Identical, or monozygotic, twins develop from the same fertilized egg that splits into two. These twins are the same sex and share the same genes. Sometimes called paternal twins, identical twins ...

Are we destined to be smart? Twin studies reveal strong genetic roots for IQ, yet up to a third of intelligence is shaped by environment, context, and choice.