Indirectly, yes it does. But it can only act on genotypes through their phenotypes.
Natural selection favours phenotypes that bestow a reproductive advantage, thereby increasing the frequency of alleles (genotype) producing those 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.
I know of no government that acts, in any direct or significant way, on natural selection.
Yes, that would be called the Homologous structure, and that changes in natural selection.
no there is no genetic variation for natural selection to act upon
This is backward, natural selection works on genotype not phenotype.
It doesn't. Phenotypes are viable or not in a given environment, and this influences whether the corresponding genotypes get passed on. Selection works on genotypes via the effects of their expression, their phenotype. The answer you may be looking for is that phenotypes maladapted to their environment have less babies, and pass on less copies of their genes. "Natural selection" is the whole process over generations. "Selection" may refer to misadapted bodies/phenotypes reproducing less due to illness, hunger, bad quality territories, dying earlier, etc.
Natural selection favours phenotypes that bestow a reproductive advantage, thereby increasing the frequency of alleles (genotype) producing those 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.
yes
Natural variation in artificial selection is used because humans choose from among the naturally occurring variation s in species. Natural selection is related to species fitness because Darwin called natural selection survival of the fittest because those that could survive would carry their species on there for being the naturally selected.
I know of no government that acts, in any direct or significant way, on natural selection.
Yes, that would be called the Homologous structure, and that changes in natural selection.
no there is no genetic variation for natural selection to act upon
It acts on populations.
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Yes it does. Without variance in the organisms genome, that gives variance to the phenotype, there would be nothing for natural selection to select from.