As a "mirror" twins look as compared to the fact
Monozygotic (identical) identical twins are formed from a single zygote (one egg fertilized by sperm one) partitions in the crushing step into two (or more) parts. They have the same genotype. Monozygotic identical twins are always the same sex and have a very large portrait similarity.
among monozygotic twins is often marked by a great similarity of character, habits, and even biographies. Approximately 25% identical twin mirror. This can be expressed externally (in a mole on his left cheek, the other - on the right), or even in the arrangement of the internal organs (like the heart of one of the twins may be right), is often one of those twins left-handed, the other - the right-hander.