the important thing to remember here is that there is identity and similarity. Depending on how we define similarity the percentages vary wildly. Can we find m

the important thing to remember here is that there is identity and similarity. Depending on how we define similarity the percentages vary wildly. Can we find millions of similar regions in the fruitfly as in the human? Yes. Are those regions on the same chromosome and on the same relative orientations - not even close. If you start reading the genome from left to right, the human and fruitfly are not even remotely similar. If were to chop the DNA into 100bp pieces now you can find a lot of matches across the organisms, still many sequences will be very different. One basepair difference could lead to a completely different protein. Then the fruit fly genome is 300 million bases long, the human is 3 billion bases. You can see how there is a lot more to similarity than initially meets the eye.