Are fingerprints unique or can identical twins share the same friction ridge skin?

• A. Fingerprints are identical in identical twins.
• B. Fingerprints are unique; no two people have the same friction ridge skin, not even identical twins.
• C. Fingerprints vary only by finger.
• D. Fingerprints are the same for everyone.

Answer: (B)

Fingerprints are unique because ridge patterns develop from a mix of genetic guidance and random developmental factors in the womb. Even though identical twins share the same DNA, tiny variations in how their skin grows and how the ridges form lead to distinct patterns for each person. These individual differences include the exact arrangement, density, and minutiae points on each finger, making it highly unlikely for two people to have the same friction ridge skin.

This is why the statement that fingerprints are unique and not shared even by identical twins is the best description and underpins their use in identification. The other ideas don’t fit because they imply sameness or limited variation: identical twins do not have identical prints, prints aren’t the same for everyone, and the variation isn’t limited to differences between fingers alone.