Identical twins are formed when a single egg that is fertilized divides into two or more after conception and since they are formed from a single zygote (egg) they have the same genetic characteristics. But fingerprints are not characterized by genetics. It is actually determined by the interaction of the genes of the individual and the environment in the uterus and since identical twins develop in different environments their fingerprints are different.
The final pattern of fingerprints are thought to be influenced by environmental factors such as nutrition, blood pressure, position in the womb and the rate of growth of the fingers. You may find similar patterns of ridges and whorls but there will be differences.
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