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Why must there be Variation in the population in order for natural selection?
Wiki User
∙ 6y ago
Without the subtle differences on organisms phenotypes what would natural selection select from?
All organisms in a population are variants and some survive and reproduce better than other against the background of the immediate environment and these are selected by that environmental pressure.
Brady Pfannerstill
Wiki User
∙ 12y agoThink about it. Without genetic biodiversity, the entire population would be affected in the exact same way by the same things.
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Why must a population have a genetic variation in order for natural selection to occur?
Without variation there is nothing to select from.
In order for evolution by natural selection to occur what has to happen?
There must be genetic variation, the variation must be heritable, and there must be differential reproduction (due to competition).
What is the order of natural selection?
Simply put. Mutation, variation and selection against the immediate environment.
Are new alleles made by natural selection?
No - natural selection does not create new alleles. Variation in alleles needs to exist in the population in order for natural selection to occur. Natural selection will involve the change in allele frequencies over time, but it does not create new alleles. New alleles are the result of mutations.
Why must there be variation in a population in order for natural selection to occur?
What would there be to select from if all the organisms in a population were not different in morphology and behavior. Some of these differences are reproductively successful against the immediate environment, and that environment is the natural selector.
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.
Natural selection need in order to take place?
Natural selection needs competition in order to take place.
What two testable assumptions were the basis for Darwin's hypothesis?
Darwin made bold assumptions about heritable variation, the age of Earth, and relationships among organisms. First, in order for beak size and shape to evolve, there must be enough heritable variation in those traits to provide raw material for natural selection. Second, differences in beak size and shape must produce differences in fitness that cause natural selection to occur.
How does natural variation affect evolution?
Natural selection (the driving force of evolution) is the selection of genetic variations by how they effect the organism's chances of survival or reproduction. If they diminish it's chances, the organism or it's immediate offspring die and the gene is gone. If the genetic variations increase it's chances, then it survives. Without genetic variations there can be no evolution. Natural selection is the selection (by environmental pressures) of those variations.
Why do scientists say that the environment selects the traits that allow an organism to survive and reproduce?
Short answer: it doesn't. Natural selection is an effect caused by the reproductive success or lack thereof of individual strains. Random variation will produce traits A and B. Organisms with trait A will be more reproductively successful than organisms with trait B. This results in trait A achieving dominance in the population, while trait B fades from the population. We then say that natural selection has occurred.
What is the difference between selective breeding and natural selection?
In natural selection, the animals take time and evolve slowly. In selective breeding, humans can transfer genes from one organism into another organism.
What conditions must exist in the population in order to use the hardy weinberg equation to calculate genetic variation in a population?
All organisms must reproduce.
