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maryrippe10 maryrippe10
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12 years ago
I'm a little confused about how DNA evolved and it's origins. Further explanation would be much appreciated!
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12 years ago
There are numerous theories for this, and it's hard to pick and choose which one is most accurate. While there is no direct fossil evidence for the evolution of DNA (because of its size and fragility), scientists have theorized on its origins based on verified laboratory evidence.  One theory goes like this:  DNA began as a simple self-replicating peptide, possibly containing no more than 32 amino acids, which formed naturally (and somewhat easily) in the early oceans of Earth.

Once self-replication had been achieved, the forces of Natural Selection took over.  For example, those molecules which were protected from the elements survived longer and reproduced more.  So, any molecules which found themselves with a lipid bubble (which also forms naturally) would have a better chance of reproducing.  After many incremental steps, the lipid bubbles eventually became cell membranes, and the molecules DNA.
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12 years ago
The process is called abiogenesis, here's a really nice video:
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