Metastable epialleles may sound like complex science, but they help explain why identical animals can still look and act differently. For years, scientists asked why two mice with identical DNA could ...

Twins may often make you imagine two babies with the exact physical features, such as eyes, smile, and even voice. However, this is not the case with every twin, as some look totally different from ...

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 ...