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What happens to the variation in traits which are under strong natural selection?
Wiki User
∙ 11y ago
It depends on which form is being favored by selection.
In directional selection, one of the extremes of the "bell curve" has the advantage. In this case selection will "drive" the variation toward one end. Example: a population of birds where long, narrow beaks have an advantage; variation will be pushed toward longer, narrower beaks until that stops being advantageous.
On the other hand, sometimes selection favors the "middle of the road" form. In this case, the variation will be driven toward the middle and the extremes will drop away. For example, a population of moths where a medium shade of coloring has the advantage (not too light or too dark); in this case, you'll get more gray moths, less black and white. This is "stabilizing selection".
Wiki User
∙ 11y ago
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How natural selection takes place?
simply put, only the strong will survive
What explains natural selection?
I'm sure Darwin has a much better technical explaination but after all is said and done it simply means: The weak and stupid die at a much faster rate than the strong and intelligent.
Why does free competition and natural selection seem wrong in our present social system?
By the way, this article is not talking about animal breeding issues or human breeding issues, which is not my concern, not this moment. It is about how nature uses its laws to decide intelligent living thing's existence and how human can adapt. It is not the natural law --- "free competition natural selection" is wrong but the specific meaning of it at the present social system development level is not applicable to the changed system, though its general meaning still apply. The usual meaning we use is the specific meaning of it --- competition in a process. That determines who win and who lose in a process. But the general meaning of "free competition, natural selection" includes system selection that determine processes connections and final survival. Natural selection has different forms and different selection levels, higher level selection always are more important and more decisive than the lower level ones. The natural selection we usually talk about is the process selection. It is a lower level selection on strategic and tactic level. This is the specific meaning of natural selection; it is widely used in game theory, social biological and social behavioural studies. But the general meaning of natural selection include all forms and all levels of selection including system selection which is a higher level selection which can override process selection and be the decisive selection that decides final survival. Use value has power and it only can be converted from real value --- natural value which is natural resources. Under natural process over use resources make more power and power is the hard force that always prevails. Competition pressure and natural process will always tend to cause more over use of resources but at this moment of social development, natural mechanisms on this process level cannot function to check human activities and resources are facing exhaustion and environment loading capacity are facing limit. So the natural development of this process is human life chain cut early --- extinction (natural mechanisms only on this process level can check human destruction). This is an example of winning a competition in a process does not mean "win" in a general meaning --- they extinct. The only way to achieve the general meaning of "win" is use rationality to overcome the process disadvantage of instability to win natural selection in system level --- recognise and obey natural law to use rational thinking directed rational efforts to establish rational social system and carry out rational process in it to connect human with higher level of evolution process and continue to survive. Here, the fittest is the rational beings and nature does select them. When social system evolved to high level and the structure and function become highly manmade, we have to overcome process selection pressure to win natural selection on system selection level to connect our present evolution process to a higher level of evolution process and continue to survive into far future. So, though the specific meaning of free competition and natural selection is conditional in our present social system but the general meaning of it is absolute --- it is an absolute law of the nature and can be applied universally and unconditionally. For instances: though the natural tendency driven natural process (such as self-interested opportunists'' short-sighted behaviour) will always have the advantage of natural process favoured thermodynamic stability and behavioural strategy stability, but when social system naturally developed into a critical point that the system no longer can continue under natural process, those process favoured self-interested opportunists if still stick to their old way of unlimited exploiting the nature, they will be selected out by natural selection that select out the old natural social system with its natural process. Nature selects the rational social system on system selection level that overrides process selection. That is why the endless and unlimited exploitation of natural resources will only win those smart self-interested opportunists a short while of easy life by whether choose cooperative strong development or competitive strong growth, they will all be gone with that social system --- they bring that system down along with themselves and the process that favour their behaviour. As a human being, it is actually themselves that selected themselves out of existence but not really nature's doing. A rationalist doesn't mean selfless, he just smarter --- he can rationalise his short term interest so that to get the ultimate interest --- perpetual existence.
What are advantages of variation?
Advantage- On the species level, variation allows a population to maintain a healthy diversity, allowing it to cope with changing circumstances.Disadvantage- On the individual level, variation may lead to detrimental changes as well as neutral and beneficial changes.
What is selection in evolution?
I guess you mean 'natural selection'. The term 'natural selection' in evolution refers to the process by which those animals, plants etc., with the best 'qualifications' are able to a) survive and subsequently b) pass on their genes to next generations. Whether an animal or a plant survives depends on multiple factors in its environment (availability of food, access to food, predators, strength, protection against diseases, climate, etc.). Genes have numerous variations from generation to generation. These are small but over a long period of time (many generations) can, through natural selection, become distinctive features of a specific animal or plant, up to such a point that it becomes a new species. Imagine a bird having offspring: 6 chicks one of which has a particular genetic variation which makes the muscles of its wings stronger than the ones of its 5 brothers and sisters. This enables this particular bird to avoid predators with more ease, to fly faster and further while looking for food. This means it stands a better change to survive and have offspring than its 5 brothers and sisters with 'normal' wing muscles. And when it does have offspring, it is very likely that it too will have the same genetic variation and thus the same strong wing muscles and thus have the same advantage over other birds. That is 'Natural Selection'. Note that genetic variations can also give an animal a specific feature which would be detrimental to its survival and procreation efforts. For example, a newborn antilope which is blind due to some genetic variation would have a very hard time gathering food and be an easy pick for predators. It's chances to procreate (and thus pass on its genetic blindness to other generations) are minimal which on itself is positive for the antilope species in general as it assures only the healthiest, best adapted antilopes procreate.
Which does natural Which does natural selection affect?
natural selection is basiclly only the strong survive which means it effects the weak by killing them but bernifits the strong
How does environmental pressure affect natural selection?
When nothing happens to exert strong population pressure on that population, natural selection favors the allele frequency already present. When mutations cause new traits, natural selection weeds these traits out because they're not as efficient as the others.
What kind of selections occurs in many birds when males that build strong nests help care for young are chosen by females as mates?
This is called, sexual selection.
What are five strong points on evolution?
Darwinism Religious Execution Natural Selection Atheism Richard Dawkins
The weak died and the strong survives?
Also known as Darwins theory of Natural Selection, as in survival of the fittest.
How natural selection takes place?
simply put, only the strong will survive
Good things about a zombie invasion?
Natural selection. Only the strong, and smart would survive... or the very very lucky.
Does natural selection favor the strong why or why not?
Right from the start, the terms "strong" and "favors" should be defined. Natural selection "favors" simply in that the mechanism allows the continuation of those who are better suited to their environment. "Strong" and "fittest" are synonymous in this regard, because it's not referring to physical strength. Natural selection only favors those who are able to survive long enough to reproduce and thus pass on their genes. That's all there really sis to it.
What does natural selection act upon?
Natural Selection is driven by random mutations and sexual reproduction. Organisms produce more offspring than can survive. These offspring compete for resources for food and water and who can aviod stuff such as predators and disease. Sexual Reproduction allows a population to have variation. If all of a population was the same, then it could easily die out if it had a adaptation that decreased its chance of survival. With sexual reproduction, all of a population has some sort of variation. Random Mutations allow organisms to gain new adaptions to help them survive in their environment. Together, Random mutations and sexual reproduction allow organisms that can survive in their environment survive and pass on their genes to their offspring.
What are the four stages of natural selection for a turtle?
The four stages for a natural selection of a turtle are the same as any other species; 1. Overproduction- more offspring are produced that will survive. 2. Struggle to survive- only the strong survive and those traits are passed to future generations. 3. Genetic Variation- Different turtles have different traits. Those with desirable traits will reproduce. 4. Successful reproduction- Make it to adult hood and reproduce.
Does natural selection operate on today's society?
i believe that it does because as life goes on more and more of the weak are dying out nd soon only the strong will survive
How does sexual production affect a variation?
Many traits are passed half from the mother and half from the father, so this allows strong variation in the offspring
