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What comes first mutation or natural selection?
Natural selection can only work on genetic variation that already exists. So mutation comes first, then natural selection.
Why does natural selection work on organisms phenotypes rather than their genotypes?
This is backward, natural selection works on genotype not phenotype.
How long does it take for natural selection to work?
"Natural selection is the process by which heritable traits that make it more likely for an organism to survive and successfully reproduce become more common in a population over successive generations. It is a key mechanism of evolution." - Wikipedia.orgThey key words in this statement in which describe Natural Selection is: Successive Generations. Meaning more than one, or even a few generations. Therefor your time in which an evolutionary trait takes to develop depends on two main factors: The type of Organism that you are studying, and the environment in which it lives. If there are less "X" factors then the Organism will be able to advance much more quickly.
Why does natural selection only work on phenotypes?
Natural selection is based on the environment and on the traits of organisms. Organisms with more suitable traits are more likely to survive until reproductive age, while organisms with less suitable traits are more likely to die before they can reproduce. Most of these traits are genetic traits. The phenotype is the set of all genetic traits. Natural selection is not determined by genotypes, because genotypes are merely an organism's genetic makeup. Only the dominant or somewhat dominant alleles in the genotype will also appear in the phenotype. However, genotypes still contribute to natural selection indirectly in that two alleles in two parents' genotypes which had not appeared in their phenotypes could be inherited such that they are in the phenotype of the offspring.
Does natural selection work on a variation already present in a population?
Yes.
Why was Charles Darwin work important?
because he created the natural selection
Time why does natural selection continue to work?
Natural selection creates a stronger species that is able to live longer and produce more. It continues to work because after a few generations, the traits will become common in the population.
Why does natural selection continue work over time?
Natural selection creates a stronger species that is able to live longer and produce more. It continues to work because after a few generations, the traits will become common in the population.
How does adaptations work?
Adaptations are changes in an organism's physical or behavioral characteristics that help it survive and reproduce in its environment. These changes can be gradual over many generations through natural selection, allowing individuals with beneficial traits to pass them on to their offspring. Adaptations increase an organism's fitness by enhancing its ability to thrive in its specific habitat.
How is natural selection?
Natural selection is often portrayed by laymen is a black-and-white process, a process that acts by killing off all less fit organisms. Fitness itself is often portrayed by these same laymen as referring to an organism's health, strength, intelligence, speed. Neither is correct. Natural selection is a stochastic process: it works through averages. And it doesn't work by killing off less-fit organisms only: it works through reproductive success; the average chance of an organism raising fertile offspring. And fitness refers only to the average reproductive success that a particular combination of traits proffers.
Why is variation important for natural selection and what are the main sources of this variation?
Without variation natural selection would have nothing to select from that would confer survivability and reproductive success. on the organisms being selected against the organisms conspecifics and the immediate environment. Mutation and sexual recombination provide the main sources of this variation that is needed to make selection work. Mutation is the variation presented that causes the real adaptive change that can lead to speciation.
Who proposed a theory of evolution by natural selection similar to Darwin?
Alfred Russel Wallace, a contemporary of Charles Darwin, independently proposed a theory of evolution by natural selection that was similar to Darwin's. Wallace's work on natural selection prompted Darwin to publish his own views on the subject. The two scientists jointly presented their work in a paper in 1858.
