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Results tagged with evolution
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user 3952
Changes in the heritable attributes of populations of organisms over time. The mechanisms of evolution are mutation, migration, drift, and selection.
4
votes
Why don't most animals have "heads" in the middle of their bodies?
We generally define a "head" as something that comes at the top/front of the body. I think that, we're likely to ignore examples of animals with nervous systems / sensory systems not at the top/front …
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2
votes
Accepted
Systematic difference of diversity between sister taxa?
Evolution 52: 403–415. (Behind paywall, free pdf here).
Gillespie R. 2004. Community assembly through adaptive radiation in Hawaiian spiders. Science 303: 356–359. …
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3
votes
Has there been any observation of species adapting the evolution process?
He sees what you're asking about, which he calls "evolvability", as one of the key topics for the future of the study of evolution. … In a sense, this is also the "evolution of evolution".
Pigliucci M. 2008. Is evolvability evolvable? Nat Rev Genet 9: 75–82. Behind paywall, but free pdf here …
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15
votes
3
answers
793
views
Why is venom more common in fish and snakes than other vertebrates?
Reading this question, I wondered why is it that we associate vertebrate venoms so often with snakes and fish, and more rarely with lizards, amphibians, mammals, and birds (apparently never, in birds? …
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27
votes
Do animals exist with an uneven total number of digits?
Coscinasterias calamaria, the Eleven-Armed Sea Star! (Although I doubt it has much to do with pi)
Image from Wikimedia Commons
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3
votes
Definition of "Regime of selection"
I'll kick this off with an attempt at a definition: a selection regime is
the set of selective pressures on a population
As in, "alteration of selection regime resulting from harvest" (Mooney & McG …
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5
votes
2
answers
229
views
Is there theory that connects longevity, time-scale of environmental disturbance, and adapta...
I'm thinking here about environmental disturbance or like climate change-driven warming. It seems as if there are two macroevolutionary ways to deal with environmental change:
1) Have short generatio …
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