Is DNA the source of life?

Question

All life on Earth shares common DNA.  The theory of evolution states that all came from a single shared source. If I exist because My fathers DNA joined with my mothers DNA and that made ME. Then the whole theory that all life came from a single source falls appart. You cant have a single source begining without something causing it to mutate (Change). I.E. the introduction of a foreign DNA source. So, for evolution to be possible in this manner there would have to be TWO seperate and distinct sources of DNA to combine and mutate to produce an offspring that shares DNA from both sources but not 100% of either. The vast diversity of life on Earth could NOT have come from a single source. And can not be explained by the theory of evolution. Each species has it own adaptations to the environment in which it lives yes. Its called Genetic Mutation. All life shares DNA yes, but all life does NOT share that same source. Each kind had to have come from its own source. I think the reason we all share common DNA is because all DNA come from the same material. NOT the same source. So, Where did it all start?

? · Accepted Answer

lay off the pot

Labsci · Answer

Most life on Earth does not reproduce by sharing DNA. Most organisms reproduce by asexual reproduction. This includes bacteria, protozoa etc. The number of organisms which have a mother and father is small, relatively. But evolution still occurs in these organisms, because mutations are constantly occurring. Those that are beneficial will be maintained and passed on the subsequent generations. There is nothing in your argument which precludes a single original source of life on Earth. If all life shares the same DNA, then it is likely that we have a common origin. There are different versions of DNA possible, but all life has the same version. It is unlikely that life would have different origins, but share the same version of DNA. Having thr same source is the only rational explanation. 
DNA may, in itself, be a mutation from RNA, which may be the origin of life as we know it. 
.

Erik · Answer

"without something causing it to mutate (Change). I.E. the introduction of a foreign DNA source."

You are absolutely wrong that mutation requires a foreign DNA source. The rest of your argument thus falls apart.

Furthermore, you obviously haven't heard of the RNA world hypothesis.

"Each species has it own adaptations to the environment in which it lives yes. Its called Genetic Mutation."
No, its not called that.

Slan&#39;na · Answer

It' started in same chemical sea. From first amino acids. to RNA, to DNA. You don't need 2 sources for it to mutate. Read book of evolution. First come bacteria. They do not have mother and father. Just one cell dividing on 2. Just like many organisms. This diversity can come from one source, 4 billion years have past since the begining of life on Earth. DNA had plenty of time to evolve. There are plenty of studies on similarity between our species and Saccharomycetes cerevisie's DNA.

Bastion 「A」 · Answer

In short:  you're wrong.  The vast majority of species on Earth reproduce asexually and don't require two sources of DNA/RNA.

Is DNA the source of life?

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