Why are nearly identical genetically in coding sequences and have many proteins that are identical in structure and function, but each human has a unique DNA fingerprint?
Why are humans identical genetically in coding sequences but not in fingerprints?
The key to your question is in the word "nearly".
We are all identical in those areas essential for life, growth and reproduction... such as the proteins you mention... if a particular protein is missing because of a mutation in the DNA then that individual may be unable to pass on that particular DNA sequence to future generations because the missing protein will cause disease or death.
Other variations of DNA such as those that enable differences in eye and hair colour, height and many others are less important for overall survival so many differences are seen. It is these differences in the DNA which gives each person their unique DNA fingerprint.
Reply:Approximately 98% of our genetic material is identical. The other 2% determines hair, skin tone, etc.
Fingerprints are derived by the way we grasp things. It is the the way skin is worn down. Identical twin will have the same genetic code, but different fingerprint patterns.
Reply:Because genetic information is not the only factor that shapes us. The human genome mapping project showed the information in our genes to be much less than had been anticipated. There are other factors at play in development and not all are understood. Anyone searching for the criminal gene, musical/artistic gene, etc. is likely to be disappointed.
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