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Explain why the evolution of resistance to antibiotics in bacteria is an example of directional natural selection?
Wiki User
∙ 10y ago
All bacteria, as are all organisms, are variants and some of these variants are resistant to antibiotics. So, a population of bacteria, in their immediate environment, are subjected to an antibiotic and most succumb. So, the resistant, survive the onslaught ( are naturally selected ) and reproduce progeny that are also resistant to the antibiotic. So, allele frequency shifts and evolution occurs die to the adaptive change conferred on the progeny population by natural selection.
Wiki User
∙ 10y ago
Wiki User
∙ 11y agoWhen a population of bacteria is bombarded with antibiotics, the 'weak' ones will die. The ones with some resistance built in will survive, and divide to form a new population of copies of themselves, or a resistant population. This in itself is survival of the fittest in a very pure form.
Wiki User
∙ 10y agoThe evolution of resistance to antibiotics in bacteria is an example of directional natural selection in the sense that the strongest strains of bacteria survive the process of natural selection.
Wiki User
∙ 12y agoA selection pressure is applied, antibiotics, and some variations of bacteria are resistant to the antibiotic and go one to reproduce the next generation of bacteria also resistant to the antibiotic. Natural selection, the nonrandom survival and reproductive success of randomly varying organisms, followed by evolution, the change in allele frequency over time in a population of organisms.
Anonymous
It is a specific type of drug resistance. Antibiotic resistance evolves naturally via natural selection through random mutation, but it could also be engineered by applying an evolutionary stress on a population.
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What contributes to the spread of antibiotic resistance among pathogenic bacteria?
Directional Selection
Increased resistance in bacteria after repeated exposure to antibiotics is due to?
Natural selection
What are the three patterns of of natural selection?
directional selection,stabilizing selection, anddisruptiveselection
What type of selection is this?
directional selection
What selection favors organisms with phenotypes that are at one extreme rlative to the average phenotype?
Tends to result in a population whose individuals have extreme traits is what? ----> it is directional selection
In a population of horses an extreme phenotype is favored and the distribution of genes in that population shifts toward that phenotype What is the process called?
directional selection
What is the primary directing force in evolution?
Answer 1The most important directional "force" in evolution is natural selection, or differential reproductive success.Under natural selection I include sexual selection. Note that other people may list these two forms of selection under separate headers. Sexual selection is when organisms display preferences for mates with specific attributes, such as a colourful plumage, or broad hips and large mammaries.
How does resistance to antibiotics in humans and pesticides in insects exemplify the process of evolution by natural selection?
So, you use antibiotic on bacteria and insecticides on insects while knowing all organisms are variants and some will survive your attacks and reproduce the next generations that will also have the survivability traits. Not quite natural selection, as it is not the environment doing the selecting, but quite effective in causing evolution by selecting the alleles that will survive and reproduce. Evolution is the change in allele frequency over time in a population of organisms.
When individuals at only one end of a bell shaped curve of phenotype frequencies have high fitness the results is?
Directional Selection.
What are the three types of evolution?
1. Directional selection 2. Disruptive selection 3. Stabilizing selection If you need to know more about them then just research. Trust me, it's easier to look it up than it is to ask the question.
Is evolution directional?
No, evolution is not directional as the definition is; the change in allele frequency over time in a population of organisms. Google barnacle to see that evolution has no particular direction, but the adaption of the organism to the immediate environment.
How natural selection favor evolution of drug-resistant pathogens?
Those pathogens that survive the drug attack and then reproduce progeny having this same resistance is a classic selection scenario.
