Why do some people have different fingerprints, even identical twins?
Quick Answer
Fingerprints form before birth and are shaped by both genes and tiny random differences in the womb. That makes them unique, even for identical twins with the same DNA.
The Full Story
Fingerprint patterns begin developing during fetal life, roughly in the first and second trimesters. Genetics influences the overall pattern type, but pressure, growth rate, and position in the womb create small random differences in the ridges. Those tiny developmental variations are enough to make each fingerprint unique. For that reason, even identical twins do not share the same fingerprints, which is why fingerprints became such a useful tool in forensic science.
Key Facts
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Suggested video title for this topic:
"Why no two fingerprints are exactly alike"
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