Actually I did a little research on the latest data and here are the results. We share 99% of our DNA with the Chimpanzee, 98% with the Bonobo and the Gorilla, 97% with the Orangutan. Those are the top 4. Now to show the rest of the story, we share 99% of our DNA with lettuce, 90% with cats, 98% with bottle nosed dolphins (we share more of what are thought to be the intellect genes with dolphins that with primates) and 98% with pigs. Of course the pitfall of the simplistic idea that we have shared DNA with every living thing and ranking those shared genes by percentage is that when you compare only the protein-encoded portion of DNA , as these numbers represent, is that only 1 to 2% of our DNA actually encodes proteins. Most of the rest is transcribed into RNA. Some RNA is translated into chains of amino-acid that make up proteins and Some RNAs that don't carry the plans for proteins have important structural or functional roles in their own right. Transfer RNAs, for example, ferry specific amino acids into a growing protein, while ribosomal RNA constitutes part of the factories in cells that manufacture proteins. So, when you take that into account, based on the most recent analysis, scientists say we most certainly share a distant ancestor with the Lemur and have a relative with the mouse closer back in time than the one we share with a Chimpanzee. That said, the parts of the genome that don't encode proteins tend to evolve rapidly, so you can have significant regions of the genome where there's no discernible similarity between species, so most sequences will not line up when you compare genomes between species and of course it's those sequences that make us different. In other words we share the actual genes but sequencing is what makes the difference between humans and lettuce. So, with that in mind, you see that cross species DNA analysis has very little in common with your simplistic example. It's analogous to the difference between 3rd grade math and calculus.