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The phenotype of organisms determines the way they interact with one another and with their environment. The way organisms interact with one another and with their environment determines how well each organism is able to compete for resources and mates - what the chances are of that organism successfully raising fertile offspring, in other words. Such offspring will likely carry the genes that give them their parent's successful phenotype. So over the generations, the genes that produce such successful phenotypes will become more numerous in the population, causing a shift in the average of phenotypes towards this successful phenotype.
Wiki User
∙ 9y ago
Wiki User
∙ 10y agoNatural selection is the differential reproductive success of alleles in the population gene pool. Varying alleles, when expressed as phenotype, cause variations in the way organisms interact with their environment. This causes organisms to be more or less successful in getting their alleles copied into offspring. As a result, alleles will be present in higher or lower numbers in future generations. And of course the same goes for the phenotypic variations that these alleles code for.
Wiki User
∙ 10y agoWhen natural selection happens, your body is choosing which genes your body gets. You get 50% of your moms genes and 50% of your dads. Your body matches up each genotype (which is like hair color or eye color or skin color or height ect) it will result in two "letters". One mom and one dad. If you get a dominate "letter that will automatically become your phenotype (physical/visiable trait ). If you get 2 ressesive genes. That will be your phenotype also. But if it is one dominate one ressesive, you will be able to pass on both traits to your child. So basically natural selection will tell you what you look like because all of that is done by random. That's why twins and simple siblings can look completely different.
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Why does the environment act on natural selection?
I know of no government that acts, in any direct or significant way, on natural selection.
Can natural selection act upon body shape?
Yes, that would be called the Homologous structure, and that changes in natural selection.
Can natural selection occur without variation in a population?
no there is no genetic variation for natural selection to act upon
Does natural selection act on genotypes?
Indirectly, yes it does. But it can only act on genotypes through their phenotypes.
Natural selection can only act upon a certain trait if the trait is?
heritable
Does natural selection act on the phenotype?
yes
What is the only thing that natural selection can act on?
The phenotype or genome of the individual organism. Remember, individuals are selected, populations evolve.
Why does natural selection act on the phenotype and not the genotype?
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Is inheritance a requirement for natural selection?
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.
Why does natural selection act on phenotype rather than genotype of an organism?
This seems to be an odd question to ask... Unless I'm mistaken, the phenotype of a given organism is governed by its genotype, and changed a fair amount by the organism's environment. Consider the following circumstances: Organism A has a long set of arms, and has a "long arm" allele. Organism B has short arms and a "short arm" allele. For example, A's genotype has the "long arm" allele, and seen in its phenotype it has long arms. The converse is true for B. Judging by your usage of technical terms in your question, I'm sure I don't need to tell you that A will out-compete B, assuming they are in a food-is-up-high environment. So, A will end up with more offspring than B, again assuming that A and B are members of different species. Eventually organism A will become prevalent, and natural selection will have caused there to be more organisms with the "long arms" phenotype, and the "long arm" allele in their genotype. In summation, Genotype governs Phenotype, and the best geno- and phenotypes will be chosen by natural selection. By an organism having a superior phenotype, it also has a superior genotype.
Why does natural selection act on the phenotypes rather than the genotypes of an organism?
This seems to be an odd question to ask... Unless I'm mistaken, the phenotype of a given organism is governed by its genotype, and changed a fair amount by the organism's environment. Consider the following circumstances: Organism A has a long set of arms, and has a "long arm" allele. Organism B has short arms and a "short arm" allele. For example, A's genotype has the "long arm" allele, and seen in its phenotype it has long arms. The converse is true for B. Judging by your usage of technical terms in your question, I'm sure I don't need to tell you that A will out-compete B, assuming they are in a food-is-up-high environment. So, A will end up with more offspring than B, again assuming that A and B are members of different species. Eventually organism A will become prevalent, and natural selection will have caused there to be more organisms with the "long arms" phenotype, and the "long arm" allele in their genotype. In summation, Genotype governs Phenotype, and the best geno- and phenotypes will be chosen by natural selection. By an organism having a superior phenotype, it also has a superior genotype.
What level does natural selection occur at?
natural selection occurs when animals need it
Why does the environment act on natural selection?
I know of no government that acts, in any direct or significant way, on natural selection.
Can natural selection act upon body shape?
Yes, that would be called the Homologous structure, and that changes in natural selection.
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.
Why does natural selection act on phenotype and not genotype?
Natural selection acts solely on phenotype. However, the probability of certain genotypes can be affected by the probability of a certain phenotype surviving. For example, say all the hawks eat all the dark mice and the dark allele for skin color is dominant (D). The hawk doesn't care whether the dark mice is Dd or DD, they will eat them either way and in the same proportions. This affects the genotypes of the populations because in this case, genotypes of DD and Dd will become less frequent than dd.
