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In selection individuals with both extreme forms of a trait are at a selective advantage?
There are three patterns of natural selection. 1) Disruptive selection: this is when the two extreme forms of a trait are selected for and intermediate forms are selected against. For example plants which can tolerate heavy metal ions are at an advantage on old spoil tips, whereas those which cannot tolerate these ions are at an advantage on uncontaminatied soil. 2) Stabilizing selection: this is when the intermediat forms are selected for and the extreme forms are selected against. A classic example is birth weight in humans. Babies which are much heavier or much lighter than average are more likely to die than average weight babies. 3) Directional selection:this is when one extreme is selected for and the other extreme is selected against. For example in Darwin's finches on the Galapagos Islands, during a drought larger birds with larger beaks are favoured over smaller birds with smaller beaks. See: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/E/Evolution.html http://www.evotutor.org/Selection/Sl5A.html
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What selection favors organisms with phenotypes that are at one extreme rlative to the average phenotype?
Directional selection favors organisms with phenotypes at one extreme relative to the average phenotype. This occurs when individuals with traits at one end of a spectrum have higher fitness, leading to a shift in the population towards that extreme phenotype.
What are the differences between directional selection and disruptive selection in the process of natural selection?
Directional selection occurs when individuals at one extreme of a trait have a higher fitness, leading to a shift in the population towards that extreme. Disruptive selection occurs when individuals at both extremes of a trait have higher fitness, leading to the population splitting into two distinct groups.
Directional selection tends to eliminate?
Directional selection tends to eliminate individuals at one extreme of a trait spectrum, favoring those at the opposite extreme. Over time, this can lead to a shift in the average value of the trait within a population.
What is disruptive selection and how does it impact the evolution of species in biology?
Disruptive selection is a type of natural selection where extreme phenotypes are favored over intermediate ones, leading to the divergence of a population into two distinct forms. This can result in the formation of new species as individuals with extreme traits are better adapted to different environmental conditions, driving the evolution of separate lineages.
What effect does stabilizing selection have on variation in a population?
Stabilizing selection reduces variation in a population by favoring the average phenotype, while selecting against extreme phenotypes. This can lead to a decrease in genetic diversity within the population as individuals with extreme traits are less likely to survive and reproduce. Over time, stabilizing selection tends to maintain a stable, intermediate phenotype.
What tends to result in a population whose individuals have extreme traits?
Natural selection can lead to extreme traits in a population if those traits provide a significant advantage in survival or reproduction. Genetic drift can also lead to extreme traits if there are random fluctuations in the frequency of alleles in a population. Additionally, sexual selection can drive the evolution of extreme traits if individuals with those traits are preferred as mates.
Natural selection will never favor those members of a population that have an extreme variation of a trait?
Natural selection can favor extreme variations of traits if they provide a survival advantage. For example, in a changing environment, individuals with extreme traits may be better suited to survive and reproduce. However, extreme traits can also come with disadvantages that may make individuals less likely to survive and reproduce.
What form of natural selection is shown on a graph as selection against an extreme?
Directional selection is shown on a graph as selection against an extreme. This occurs when individuals at one extreme of a trait distribution have lower fitness than individuals with intermediate phenotypes or those at the opposite extreme. Over time, this can lead to a shift in the average phenotype of a population.
Selection favors one extreme form of a trait in a population.?
Tends to result in a population whose individuals have extreme traits is what? ----> it is directional selection
What selection favors organisms with phenotypes that are at one extreme rlative to the average phenotype?
Directional selection favors organisms with phenotypes at one extreme relative to the average phenotype. This occurs when individuals with traits at one end of a spectrum have higher fitness, leading to a shift in the population towards that extreme phenotype.
What removes individuals with average trait values creating two populations with extreme traits?
Disruptive selection is a type of natural selection that removes individuals with average trait values, favoring individuals with extreme traits. Over time, this process can lead to the divergence of a population into two distinct groups, each with their own extreme trait values.
What are the differences between directional selection and disruptive selection in the process of natural selection?
Directional selection occurs when individuals at one extreme of a trait have a higher fitness, leading to a shift in the population towards that extreme. Disruptive selection occurs when individuals at both extremes of a trait have higher fitness, leading to the population splitting into two distinct groups.
What are the three patterns of of natural selection?
The three patterns of natural selection are directional selection, stabilizing selection, and disruptive selection. Directional selection favors individuals at one extreme of a trait distribution, stabilizing selection favors the intermediate phenotype, and disruptive selection favors individuals at both extremes of a trait distribution.
The type of selection in which individuals at one end of a curve have the highest fitness is called?
Directional selection. In this type of selection, the advantageous trait in a population shifts towards one extreme as individuals with that trait have higher fitness and are more likely to survive and reproduce.
Tends to favor phenotypes at one extreme of the range of variation?
This is called directional selection, where the environment selects for individuals with traits at one extreme of the phenotypic range. Over time, this can lead to a shift in the average phenotype toward that extreme.
When individuals at only one end of the bell curve of phenotype frequencies have high fitness the result is?
Directional selection, where individuals with phenotypes at one extreme of the bell curve have a higher fitness compared to others. This can result in a shift in the population towards that extreme phenotype over generations.
What type of selection may eliminate intermediate phenotypes?
Disruptive selection can eliminate intermediate phenotypes by favoring extreme phenotypes, leading to a bimodal distribution. This selection occurs when individuals with extreme traits have a higher fitness than those with intermediate traits, resulting in the reduction of the intermediate phenotype in the population.
