The propagation of every animal on the planet is the result of sexual activity between males and females of a given species. But how did things get this way? Why two sexes instead of one? Why are sperm necessary for reproduction and how did they evolve?
These as-yet-unresolved issues fascinate Timothy Karr, a developmental geneticist and evolutionary biologist at Arizona State University’s Biodesign Institute. To probe them, he uses a common fruit fly, Drosophila melanogaster—an organism that has provided science with an enormous treasure-trove of genetic information.
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