Animal behavior has evolved to battle parasites. In fact, we have parasites to thank for the existence of sex. Sex is a costly and time-consuming method of reproduction. Experiments have shown that, in the absence of parasites, species evolve toward parthenogenesis-or cloning-as the reproductive method of choice. In parthenogenesis each individual is able to self-replicate. But this produces almost no genetic variation. In the presence of parasites, cloning, while more energy-efficient, is not a viable reproductive strategy. It presents a stationary genetic target to parasites, who, once introduced into such a system, will quickly dominate it. ... (Daniel Suarez)

Animal behavior has evolved to battle parasites. In fact, we have parasites to thank for the existence of sex. Sex is a costly and time-consuming method of reproduction. Experiments have shown that, in the absence of parasites, species evolve toward parthenogenesis-or cloning-as the reproductive method of choice. In parthenogenesis each individual is able to self-replicate. But this produces almost no genetic variation. In the presence of parasites, cloning, while more energy-efficient, is not a viable reproductive strategy. It presents a stationary genetic target to parasites, who, once introduced into such a system, will quickly dominate it. ...

Daniel Suarez

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