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The natural selection process is a gradual one and is found to pose a gradual effect on the genes because the nitrogenous base bonds in the genes are not an easy task to alter and the hydrogen bonds existing between these bases would change according to change in the environmental barriers that arise out of catastrophes to which the selection has to incur. So the gradual modification is found to be observed in the level of genes in case of natural selection in animals. This was the case for Galapogous island finches in case of Darwinian studies in natural selection. The genotype variations are the gradual ones leading to changes in the phenotype of the organisms.

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Is it true natural selection can act upon an individuals genotype the external of genes?

False


What level does natural selection occur at?

natural selection occurs when animals need it


Does natural selection act on the phenotype?

yes


Can natural selection act upon body shape?

Yes, natural selection can act upon body shape by promoting traits that enhance an organism's ability to survive and reproduce in its environment. For example, organisms with body shapes that improve their efficiency in obtaining food or avoiding predators may have higher fitness and be more likely to pass on their genes to the next generation.


Why does the environment act on natural selection?

I know of no government that acts, in any direct or significant way, on natural selection.


How do genes play a role in evolution?

Evolution is, the change in allele ( different molecular form of the same gene ) frequency over time in a population of organisms. Genes are the hard heritability material that carry successful variation unto the next generation of organisms. They are also the ultimate target of natural selection in individual organisms. An organism with a gang of successful genes is reproductively successful and passes those traits on to future generations; into the populations gene pool.


Can natural selection occur without variation in a population?

no there is no genetic variation for natural selection to act upon


What does natural selection only act on?

It acts on populations.


Natural selection can only act on traits?

Yes, traits that are phenotypical in nature and confer some survival and reproductive advantage, then the alleles that gave rise to these traits become more frequent in the populations gene pool and evolution takes place. So, natural selection is acting on genes in the individuals and population are evolving from this process.


Does natural selection act on genotypes?

Indirectly, yes it does. But it can only act on genotypes through their phenotypes.


Why does natural selection act on the phenotype and not the genotype?

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Why does natural selection act directly on genes?

Selection acts directly on phenotype...expressed traits that decrease an individual's chances of surviving to reproductive age. Many alleles are rare enough that expression is almost nil so the trait remains hidden in the population generation after generation at the same frequency. Domestic descendants of wild rabbits are a panoply of colors, all part of the gene pool where those colors were latent...or quickly eaten. Dominant alleles are directly affected by natural selection only because phenotype and both the homozygous and heterozygous genotypes are the same meaning if they were a non-viable mutation they would potentially be 100 selected against in a very few generations.