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What provides the best summary of the process of natural selection?
Wiki User
∙ 6y ago
survival - those that live have the babies and their genetic profile is perpetuated. Those that die don't have offspring and therefore their genetic profile become extinct.
Well, there is a major difference between natural selection and "unnatural selection", as I call it. What you are talking about with selective breeding is what I call unnatural selection: An artificially imposed criteria for success. If you're trying to get a dog with blue stripes, a dog with blue stripes will be more likely to survive even though genetically it's most likely a dead end.
But I digress.
Natural selection/evolution works as follows: First you have the mutation, then the selection. Over the course of generations, you occasionally have mutations. These can be of a few types: fatal, semi-fatal, neutral or beneficial. Now, if the mutation is fatal or semi-fatal, then the creature in question will almost definitely not be able to reproduce and pass down this genetic flaw (except in humans, with our advanced medicine) so this mutation effectively destroys its own chance of making it into the gene pool. A neutral mutation would not make it any more or less likely for the creature to live or die, to breed or not breed, so it would effectively have no effect.
A beneficial mutation however, would improve its chances. So now you have a creature with a beneficial mutation. This could make its reaction time very slightly faster, or it breeds more quickly, or it has slightly better camoflage (keep in mind, mutations are ITERATIVE. This means they make very tiny adjustments to the creature, not big leaps). Now, if that creature does something better, theres a higher chance of it surviving and breeding. If it survives and breeds, its children inherit this advantage. If its children are successful too, then on it goes.
If repeated mutations make the resulting successful creature different enough, eventually you get a new creature, which goes down its own evolutionary path, separate from the creature it originally was generations ago.
And there you have it, evolution in a nutshell.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoOkay, think about it like this. Lets say we have a tribe of humans somewhere off secluded. Now suppose that there was some monster or really weird animal there. This monster has the weird tendency to eat anyone who had a penis larger than his. They try to stop it, but they can't. Here's where evolution comes in. Because the big dick gene is no longer present/less common, all the boys will have small ones because their dad's had small ones. Little things like this happen many times over the course of millions of years (i.e., a monster that eats brunettes, a monster that eats tall people, etc.) eventually there will have been so many changes that we would have to consider these people a different species. They evolved. It doesn't mean a species gets better or worse, it's just life making what it can with what it's got.
Wiki User
∙ 12y agoThe environment is the natural selector and when the environment changes the course of the selection pressure changes.
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