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Why is genetic variation important for natural selection to drive evolution?
Genetic variation is important for natural selection to drive evolution because it provides the raw material for natural selection to act upon. Without genetic variation, there would be no diversity in traits for natural selection to favor or eliminate, and evolution would not be possible.
What must happen in order for evolution to exist?
Without heredity what use would there be to selection and why evolution? Just take beneficial mutations in the germ line for example. No heredity and nothing to enter the populations gene pool and no evolution. No heredity and there would be no variation in populations and the first environmental challenge would carry your population to extinction.
Evolution by natural selection works best on populatin having no variation?
Evolution by natural selection actually relies on variation within a population. Without variation, there would be no genetic differences for natural selection to act upon, leading to no evolution. Variation provides the raw material for natural selection to work with, allowing beneficial traits to be favored and passed on to future generations.
Under what circumstances would evolution not occur if?
Evolution would not occur if there is no genetic variation within a population, no selection pressure, or if there is no reproduction and passing on of genes to the next generation.
Why is variation essential for evolution?
For one, without genetic variation, a species is more likely to face significant danger from disease. In humans there are some diseases that affect a few races more than others, but because of genetic variations, our species as a whole is more likely to adapt to new diseases and survive rather than if everybody had the same predisposition toward a disease.
What would happen if there was zero variation between all of the organisms on earth?
Evolution cannot occur.
How do mutations relate to natural selection?
Mutation, a copying error in the replication of DNA, can give rise to variation in an organisms phenotype and if this new phenotype is beneficial to survival and reproductive success ( as little as 1% ) it will be selected naturally against the immediate environment, then if this so selected organism leave many descendents with the same beneficial traits then the populations gene pool will change in allele frequency and you have evolution. ( a 19th century sentence Darwin would be proud of! )
What is essnetial to evolution?
Genetic and morphological variation. Without variation in organisms there would only be the shifts of genetic drift and gene flow in organisms. When organusms are varied then one can be selected from the other by the environment and the organisms ability to reproduce against that environment. Then there is evolution.
How does variation work to help cause evolution?
You have to have variation in order to be able to have more successful variations, which succeed in evolutionary terms, and less successful variations which fail. If there were no variation in a species, there would be no natural selection.
How do you stop evolution?
Answer 1Evolution is a natural process, so it can't really be stopped. Some organisms that are known as "living fossils" look almost identical to their ancestors from millions of years ago. The term is actually a misnomer because these organisms have actually changed a little. The reason they have not changed drastically is because the environment in which they live has changed very little. Phenotypic variation is driven by adaptation to a new environmental pressure. If these pressures do not change, an organism can keep a similar body plan for millions of years.Answer 2Evolution is the effect caused by reproductive variation mediated by differential reproductive success of variants in a population gene pool of limited size.To stop evolution from happening, one would have to stop reproductive variation from taking place, by either stopping reproduction from happening at all, or by ensuring that all offspring are a *perfect* copy of one parent.
Can you stop crossing over to cease any kind of evolution?
Not to stop evolution, but you would be impeding variation within populations of sexually reproducing species by stooping crossing over. Only to an extent, though. One would still have to account for independent orientation of chromosomes and random fertilization. Then you have the driver of great variation to contend with; mutation.
Which reproductive would be associated with a species that is most likely to undergo rapid evolutionary change?
The answer is: sexual reproduction with a short reproductive cycle. This is the answer because evolution is the change in living things over a period of time.
