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Why do disruptive selection pressures tend to favor rapid evolutionary changes?
Wiki User
∙ 12y ago
They result in sudden gene frequency changes.
Wiki User
∙ 12y ago
Wiki User
∙ 10y agoMANSUR
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What 3 types of Selection pressures that affect a population structure?
The 3 types of selection pressure on a population: 1) "Stabilizing selection" = intermediate phenotypes are favored and extremes on both ends are eliminated. 2)"Directional selection" = is a mode of natural selection in which a single phenotype is favored, causing the allele frequency to continuously shift in one direction. 3) "Disruptive selection/ Diversifying selection" = describes changes in population genetics in which extreme values for a trait are favored over intermediate values
Which is not a cause of evolutionary changes in organism?
evolutionary changes in organisms
How does natural selection help to change organisms overtime?
Natural selection varies the death rates of individuals in the current generation. As the next generation is born with different traits derived from parents that were survivors of the current generation, the population changes gradually from generation to generation better able to survive longer against the natural selection pressures. Should selection pressures change in the future (and they very likely will) the direction of changes caused by natural selection will also change (with a corresponding but temporary increase in death rates if the change is large and sudden).
Compare and contrast stabilizing directional and disruptive selection?
Stabilizing selection is where a population is favored by just the right amount of a certain trait, and if they don't have the right amount of that certain trait then they die. Example: Human babies and birth weight, if the baby is too small, i gets sick. If the baby is too big, it cannot get through the pelvis; but just the right weight and it will come out lively and well. Disruptive selection is when an animal has to fit in with its environment; I.E., camouflage.
In nature what is responsible for creating new traits?
Evolution
What 3 types of Selection pressures that affect a population structure?
The 3 types of selection pressure on a population: 1) "Stabilizing selection" = intermediate phenotypes are favored and extremes on both ends are eliminated. 2)"Directional selection" = is a mode of natural selection in which a single phenotype is favored, causing the allele frequency to continuously shift in one direction. 3) "Disruptive selection/ Diversifying selection" = describes changes in population genetics in which extreme values for a trait are favored over intermediate values
What caused englands Biston betularia moth populations to change overtime from light colored to dark colored?
Industrial pollution making the tree bark on which the moths hide to become dark and the pressures of evolutionary natural selection.
Summarise the causes of gene and chromosome mutation and suggest how these changes can bring about evolutionary changes by the process of selection using named examples?
http://wiki.answers.com/Q/Summarise_the_causes_of_gene_and_chromosome_mutation_and_suggest_how_these_changes_can_bring_about_evolutionary_changes_by_the_process_of_selection_using_named_examples"
Which is not a cause of evolutionary changes in organism?
evolutionary changes in organisms
How is disruptive selection different from directional selection?
disruptive selection favors the extremes of a range of selection Disruptive selection refers to natural selection that favors phenotypic extremes. Example (off the top of my head, but based loosely on reality): Consider a population of seed-eating birds with beaks that range in size, so that big beaks are best adapted to eating big seeds, small beaks are best adapted to small seeds, and medium beaks are best adapted to medium seeds. Now suppose that the source of medium seeds goes extinct (perhaps because of a fungal pathogen). The bird phenotype with medium beaks looses its food source; selection favors the big and small beaks.
What is a requirement for evolutionary changes to occur through natural selection?
Evolution occurs through natural selection via survival of the fittest. This means that those organisms that are most well adapted to the environment will survive and pass on their genes.
What are some common misrepresentations of evolutionary theory?
One common misrepresentation is that evolution is "just a theory" and therefore not a proven fact. Another is the idea that evolution is goal-oriented, leading to increasingly complex organisms. Additionally, the misunderstanding that humans evolved from monkeys rather than sharing a common ancestor with them is a prevalent misconception.
How does disruptive selection lead to sympatric separation?
According to Wikipedia: "Disruptive selection describes changes in population genetics in which extreme values for a trait are favored.It is believed that disruptive selection is one of the main forces that drive sympatric speciation in natural populations.Sympatric speciation events are vastly more common in plants.A rare example of sympatric speciation in animals is the divergence of "resident" and "transient" Orca forms in the northeast Pacific.Resident and transient orcas inhabit the same waters, but avoid each other and do not interbreed. The two forms hunt different prey species and have different diets, vocal behaviour, and social structures."
What are the pressures of natural selection?
Everything from available food to climate will cause the changes we see in natural selection. Random mutations occur constantly and when those mutations are beneficial for life, the genetic code is more likely to be passed on to future generations.
Do evolutionists believe in natural selection?
" Evolutionists? " Believe in? " Two words/phrases that are ideological in nature and have no place in a scientific discussion. Evolutionary scientists accept the overwhelming and convergent evidence for the theory of evolution by natural selection. This is the best explanation we have for the adaptive changes seen in evolution.
How does natural selection help to change organisms overtime?
Natural selection varies the death rates of individuals in the current generation. As the next generation is born with different traits derived from parents that were survivors of the current generation, the population changes gradually from generation to generation better able to survive longer against the natural selection pressures. Should selection pressures change in the future (and they very likely will) the direction of changes caused by natural selection will also change (with a corresponding but temporary increase in death rates if the change is large and sudden).
How do chromosome mutation bring evolutionary changes?
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