That's not true. Even though twins genetically look like two drops of water, their dermatoglyphs or fingerprints do not match. As with the growth of capillaries during angiogenesis, the pattern of the fingerprint drawing is not totally predetermined in our genes, since environmental factors also play a very important role in its design. For example, small variations in the concentration of certain growth factors and hormones can alter the configuration of dermatoglyphs.
Another perhaps more determining environmental factor is what scientists know as intrauterine forces. Among these, the flow of amniotic fluid around the fetus stands out. Due to the fact that twins occupy different places in the womb during development, each fetus is subjected to different intrauterine interactions that will make the drawing of the fingerprints – finger or digital dermatoglyphs – of the feet –plantar dermatoglyphs- and the palms of the hands –plantar dermatoglyphs- are unique.
