Fingerprints, also known as dermatoglyphs are unique patterns of ridges in the palms of the hand and soles of the feet. It is usually formed in the womb of a mother after 24 weeks of pregnancy and do not change as people age.
It can be used as a mode of identification of an individual because of its uniqueness. Surprisingly, even twins with similar DNA have different fingerprints.
However, there are some people who were born without fingerprints. There are four families in the world whose members have no fingerprints. This genetic condition is known as "adermatoglyphia" or "immigration delay disease". A Swiss woman trying to enter the United States was delayed because the immigration officer noticed that she did not have any fingerprints.
The gene mutation in chromosome 4 was found to be the cause of adermatoglyphyia. The SMARCAD1 gene is shortened in a person with immigration delay disease.