Evidence for Evolutio9

Evidence for Evolutio9 - Evidence for Evolution Swordfish...

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Evidence for Evolution Swordfish and female preference In one of my earlier posts in this series, I presented two (non mutually exclusive) models of sexual selection. Those were the "good genes" model and the "runaway sexual selection" model. Well, there is actually a third model out there also (which does not exclude the others). I'm not aware of any name for it, I'll just call it the "existing female preference" model. According to this model, females have a built in preference for a certain type of male, even if that type of male does not exist. The paper I summarize here is in the Nov 9, 1990 issue of Science. In the article, the author claims that, in swordfish, the female preference for males with swords existed before males had swords. Within the genus Xiphophorus there are swordless platyfish and swordtails. The swordless state is considered to be ancestral. Basolo (the author) experimented with females of the species X . maculatus
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Evidence for Evolutio9 - Evidence for Evolution Swordfish...

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