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 ...

When you hear twins, it is common to imagine two babies who appear the same. However, not all twins share similar physical features. Indeed, some look exactly alike, but others may have different ...

A pair of identical twins got mistaken for mother and daughter by a stranger, all because of one tiny difference in their ...

Discovered: The world's lightest material; babies understand more than we thought; even in the womb, identical twins aren't completely identical; superweeds are resistant to RoundUp. Germans break the ...

You can have three babies that are identical (if one egg splits into three embryos), three babies that are fraternal (if three separate eggs are fertilized), or two babies that are identical and one ...

Over twenty years ago, scientists noticed something unusual while studying a mouse strain called agouti viable yellow, or Avy. Some of these genetically identical mice became yellow and obese, while ...