Why do identical twins have different fingerprints

Identical, or identical twins, are the result of the fertilization of one egg and the development of two or more fetuses. These twins have not only portrait similarity, but also the same genotype. A quarter of these twins are mirrored, they may have birthmarks on different cheeks, and even a heart located on the right of one of them. But their fingerprints are always different.







Each fingerprint contains two types of signs - global and local. Global visible to the naked eye: papillary pattern can be in the form of arches, loops, spirals. This knowledge in fingerprinting is used to divide a database into classes. Next, use local signs - a detailed picture with islands, branches, endings of lines in the pattern.



Despite the external similarity, the fingerprints of each of the twins are unique , because their design is due to the interaction of the genetic code and the human environment.

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The formation of fingers of the embryo, which occurs between 10 and 16 weeks of gestation, is influenced by various aspects: the position of the fetus in the uterus, maternal nutrition, blood pressure, changes in hormone levels, growth rate, contact with amniotic fluid and skin. Globally, the probability of finding two people with the same footprint is so small that in forensic science the uniqueness of each person’s print is taken as 100%.