On the surface, fruit flies, roundworms and yeast don't seem to have much to do with fighting disease.

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Most people view the former two items as pests — and the latter merely the reason bread rises or beer ferments.

All three, however, have major utility as model organisms for scientific research.

That's because each one offers distinct similarities to the human condition, which allows researchers at University of Michigan and across the globe to study basic biological processes shaping health and disease. They also have very fast life cycles, which makes studying effects across generations much more efficient than in people.

The lowly fruit fly, for example, has almost 60 percent of the genes found in humans. One U-M team has used them to study the overgrowth of neurons associated with Down syndrome.

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The humble yeast, a single-cell organism, is providing new insights into neurodegeneration and cancer — because these illnesses are caused by the disruption of basic cell processes that are also found in these simple creatures.

And the millimeter-long roundworm, despite its tiny size and nervous system, responds to its natural environment much the same way people do. One U-M lab has discovered an ultra-efficient light receptor in the worms that has the potential to help develop new scientific tools or even better sunscreen.

Learn more about the power of these organisms in the video above.