Toad toxin resistance evolves four times, same pathway
From New Scientist: Sometimes evolution just doesn’t have a choice. Reptiles have evolved to resist toad poisons four separate times, and each time they have made precisely the same biochemical changes to do it. What’s more, an even wider range of animals show similar adaptations in response to these toxins, giving us by far the most extensive illustration of so-called convergent evolution to date. “so-called” convergent evolution? Yup. That’s what it is called. Gotta problem with that? This striking convergence on a few evolutionary outcomes probably occurs because sodium channels play such a critical role in cells. “There are very few options for a gene to modify itself to develop resistance without impairing function,” says Casewell. “It suggests that in Read More ›