Definition
Monozygotic twins, often called identical twins, originate from a single fertilized egg that splits into two separate embryos. They share nearly identical DNA, making them remarkably similar in appearance and genetic makeup. Think of it like photocopying the same document—the copies are nearly indistinguishable. Their similarities are uncanny, like seeing double! However, environmental factors can still lead to minor differences. They are always the same sex. Unlike fraternal twins, they’re basically genetic mirror images.