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They are not alike. The most-oft used argument - that humans and apes share 99% similar genomes, has been proven wrong. The only comparisons done so far pertain ONLY to the 1% of the genome which codes for proteins. No comparison has been done between the ENTIRE human genome and ENTIRE chimp genome. Such a huge and costly study would undoubtedly yield a very low similarity. When comparing ONLY the 1% of the genome which codes for proteins, the similarity is between 70% and 96%, depending on the study.

One reason why very few studies have been done on the NON-protein coding portion of the genome is because, for decades, many scientists assumed it was junk DNA - now we know this was completely wrong. So much for assuming. We now realize the NON-protein coding portion is responsible for many important functions such as preserving the genome itself! Also, a recent report unexpectedly found specific sequence patterns in "junk" DNA called "pyknons" which are responsible for determining when and where proteins are made. Furthermore, within this "junk DNA", the areas of greatest difference appear to involve regions which are structurally different (commonly called "rearrangements") and areas of heterochromatin (tightly packed DNA).

The protein coding portion of the human genome has approximately 50% similarity with bananas. There are several reasons why this is so: 1) All life on Earth is based on the same carbon/water system. 2) In order to eat and digest bananas, we must share genomic similarities, otherwise we wouldn't be able to eat bananas in the first place. Genomic similarity among us is required for all of us to live on earth. 3) If we ever found another organism which we DIDN'T share any genomic similarities, that organism would be from a completely different planet with a different life-sustaining system altogether.

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9y ago

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