Natural selection is differential reproductive success. It occurs when a population consisting of multiple variants exist in a limited environment. Some variants will be more successful - in terms of producing offspring - than other variants. The term used to indicate the measure of reproductive success of a variant is 'fitness'. The alleles (variations of a gene) of a 'fitter' variant will have a larger representation in the next generation than the alleles of a less 'fit' variant, and so the 'fit' alleles spread throughout the population at a greater rate than less 'fit' alleles. Eventually, less 'fit' alleles may even vanish from the population entirely. When an allele is so successful that it becomes the only variant for a given gene, we say that the allele has become 'fixed'.
Note that the term 'fitness' has no direct relation to the health, strength, intelligence or speed of the variant: the only measure of 'fitness' is the reproductive success of the variant.
firstly, there is genetic variation already present within the population. this variation arises randomly, from mutations or as a result of sexual reproduction.
then there is a change in the environment. selective pressures change and those better adapted to the environment survive (they are 'selected') and those who cannot adapt die.
the survivors reproduce, passing on their advantageous trait to the offspring.
over a long period of time, the new population has this trait and is able to survive in new condition.
The process of natural selection is process in which is the weaker individual deprived of reproduction.
pooping
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The main difference to remember is that natural selection is a nonrandom process while genetic drift is a random process.
Natural selection has no "sub-processes". It is a continuous process that happens under particular circumstances. The process of speciation is a related process, by which genetically distinct populations evolve from a common ancestor.
natural selection
Natural selection is only the result of changing environments, mutation and the variation resulting therein. Natural selection is the process of adaptive change and the main mechanism of evolution that leads to speciation. Natural selection is a process as mutation and variation are grist to the mill of natural selection.
Its NaTuRaL sElEcTiOn if you didn't know.
natural selection
Natural selection means survival (and breeding) of the fittest, it is key to the evolutionary process.
natural selection
Meiosis plays an important role in the process of natural selection, as it allows DNA to replicate.
The book, On The Origin Of Species, " suggested " that organisms evolve through the process of natural selection. The nonrandom survival and reproductive success of randomly varying organisms
natural selection. :)
The four stages are: Overproduction, Genetic Variation, Struggle to Survive, and Successful Reproduction
Natural selection
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natural selection