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Mitochondrions are basically highly specialized bacteria with their own DNA and chromosomes living within every one of our cells. Our DNA is completely different from theirs. The current theory is that at some point in evolution, some aerobic bacteria were absorbed by a eukaryotic cell and ended up using it for its power source.
On the subject of humans "evolving" within the past 40 years, this is a different kind of evolution than the kind under question. Having certain genotypes (eg tall) prevail in a species because it is advantageous for one reason or another is *very* different than creating a new species. Creating a new species is a much much more complicated affair, and what Creationists have the hardest time accepting.
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