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Answered 2009-04-20 22:17:34

Natural selection works on a simple premise that the better equipped have more chance of survival and reproduction. The fact that the 'better' animal has more chance of producing offspring means more of his or her genes reach the next generation than his or her weaker rivals, thus weakness is filtered out. Although luck and chance can come into the equation (a 'weaker' animal may get lucky) in the long run over generations and generations, luck is no match for 'good' genes which enable advantages in the fight for survival. The chemical process of reproduction is slightly different. When cells are creating copies of themselves to make the new being, they are essentially copying enormous sets of instructions that their parents cells followed to create them, and the offsprings cells will use to build them. As the instructions are so huge, the number of cells involved is so colossal, the number of animals involved in reproducing is vast, and the number of generations and generations, and millions and millions of years… the opportunity for 'mistakes' is likewise gigantic, no matter how accurate and efficient the cells involved are supposed to be. These 'chance' mistakes are actually something like 1 in a giga-mega-godzillion (not an official statistical measure I might add!) but because the process happens more than a giga-mega-godzillion times, mutations are seen to occur. These mutations can either improve the animal slightly, or hinder it. The mutations are never that huge as the new being would be unable to survive or find a mate if it drastically differed from the species as a whole. Of course, any improved instructions which give the being a slight advantage, have more chances of being copied in the future - the mutation is now the new standard. An interesting position on this is that cells actually evolved with this chance of mutation. Cells which were 100% accurate in their reproductive instruction copying never hit upon anything new, or advantageous to the species while the world changed around them. What was a good design then, perhaps isn't so good in today's world. Meanwhile, cells which had a 99.999999…..% accuracy were actually more successful in the fight for survival as they enabled the opportunity for mutation, and thus the opportunity for improvement - a species which can change with time is far more likely to survive in a world that too changes with time. With this in mind, you could argue randomness in cell mutation was actually naturally selected by a non-random process!

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Is evolution a mutation?

Random mutation and natural selection drive evolution for the most part.

What are the natural processes that underlie evolution?

Simply and succinctly put, random mutation and natural selection.

Which is not part of darwins theory of natuarl selsction?

Random processes are not part of the theory of evolution by natural selection. Excepting random genetic mutation that provides the variation natural selection works on.

What process is thought to have changed the genitic code over billions of years?

Random mutation and natural selection. Evolution.

Is natural selection random?

No. Natural selection is the non-random survival of randomly varying replicators. The random variation part could be thought of as mutation and recombination that the non-randompart, natural selection, works with.

What principles is not part of Darwin's original theory of evolution by natural selection?

Random processes are not part of the theory of evolution by natural selection.

How do the marlins adapt?

Marlins adapt to their environment the same way all living things do, by the process of evolution via natural selection and random mutation.

Which of the following was not part of Darwin's theory of natural selection?

There is no following but one thing that is not a part of the theory of evolution by natural selection is that natural selection is a random process. It in not a random process.

Explain the role of mutations in evolution?

Mutations are the material upon which natural selection acts. Evolution is a two sided coin. One side is mutation; the other side is natural selection. Without mutation there is no significant variation. Mutations are, however, ubiquitous. Every organism is a mutant. Evolution can be summarized as the non random survival of randomly varying replicators.

How is natural selection works to cause evolution?

Natural selection gives rise to Evolution by the non-random survival of randomly varying replicators.

What is the relationship between Hardy-Wienberg equilibrium and evolution?

When an organism is in Hardy-Weinberg equilibrium there is no evolution. There is no mutation, mating is random and thus no natural selection. Naturally, outside of labs this condition is never seen.

What are evolution and natural selection?

Evolution is both the theory concerning the origin of species which entails random mutation and natural selection, and the observations of these changes. Natural selection is the differential survival of genetically inherited traits and characteristics via the environment. This may be through competition for resources--where the strongest or fastest tend to survive, or by sexual selection, in which the "most attractive" are more likely to pass on their genetic heritage.

Why is mutation a random process but natural selection not?

Mutation is (more or less; there are examples in which mutation is less random, but still quite random) random because it is a result of the chaotic interaction of molecules at the genetic level. Natural selection, however, is - once a certain set of variants exist - predictable, to a certain degree: it is determined by the properties of those variants and the way they interact with their environment.

Which not part of Darwin theory of natural selections?

Randomness is not part of the theory of evolution by natural selection. Though the variation offered up to natural selection is random the process of natural selection is anything but random. One could say it is self-directed.

What is a mutation and what causes mutations?

A mutation is a change in a species over time and mutations are random among different animals and are chosen by natural selection

What are five causes of evolution?

The five recognized causes of biological evolution are as follows: 1. mutation 2. migration also known as gene flow 3. random genetic drift (small populations) 4. non-random mating 5. natural selection *this is the correct order

How does nonrandom mating affect evolution?

Non-random mating is otherwise known as sexual selection. Some see this as distinct from natural selection, but I think that sexual selection is merely a form of, or perhaps more a complication of natural selection. Selection, natural or sexual, is the effect that "guides" evolution, that allows evolution to produce populations suited to their environment.

What are the mechanisms that lead to evolutionary change?

Genetic drift (bottlenecking, mutation) Selection / Natural selection Pleiotropy Random Processes Reproduction / Mating

Why is natural selection not considered a random event?

Well, all natural processes have an element of chance, of course. But natural selection, deterministic as it is, is much less random than, for instance, genetic mutation. Which is why we generally distinguish between the randomness of genetic variation and the non-randomness of the filtering process that is natural selection.

5 conditions in genetic equilibrium?

Large populationRandom matingNo mutationNo natural selectionNo emigration/immigration

The mechanism by which evolution occurs is called?

AnswerNatural selection is the mechanism put forward by Darwin as one of the two essential mechanisms for evolution, the other being random mutation (which Darwin described as inheritable variation, not knowing about genes at the time).The modern evolutionary synthesis includes genetic mutations as the mechanism which provides variations upon which natural selection can act.

Why is the evolution of resistance to antibiotics in bacteria considered an example of directional selection?

It is a specific type of drug resistance. Antibiotic resistance evolves naturally via natural selection through random mutation, but it could also be engineered by applying an evolutionary stress on a population.

Why are mutation and genetic drift random events while natural selection is not?

Random means " in no set numerical order " and with mutation and drift you know it can happen, just not exactly when. With natural selection you know that if the certain conditions are met then adaptive change will happen. All selection needs is a differential reproductive success against the immediate environment for organisms that vary in traits which give some an advantage over others. So, population alleles change and evolution happens, even if speciation does not.

What are the conditons from hardy and weinberg equilibrium?

The conditions for the Hardy-Weinberg Equilibrium are no mutation, migration, natural selection or random drift.

Why is natural selection random?

In Darwin's theory, the word random means the outcome of a chain of events. For example, random variation means the random phenotype that is the outcome of a chain of events consisting of the nonrandom process of gene expression plus the random mutation event in DNA. A single random event is enough to make the outcome of a chain of events random. The selector in the natural selection processes is always random in a Darwinian mindless world. The natural selection process from the selector hot weather to death of heat sensitive variants is nonrandom (so is the process from mutant DNA to the expression of mutant protein or of mutant phenotype). But the selector hot weather is random, which makes the end results of natural selection random. The natural selection process is nonrandom but the end result could still be random if the selector is randomly caused. In contrast to natural selection, artificial selection by human breeders is non random.