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Disruptive selection occurs when selective pressures favor extreme phenotypes over intermediate phenotypes within a population. This can lead to increased diversity as individuals with traits at both ends of the spectrum have a reproductive advantage. As a result, disruptive selection can promote speciation by encouraging the divergence of populations with distinct traits.
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Selection occurs when the environment continually eliminates extremes at both ends of a range of phenotypes?
Selection refers to the process by which certain traits become more or less common in a population over time, based on their impact on survival and reproductive success. In this case, the environment acts as the selective pressure by favoring intermediate phenotypes and reducing the presence of extreme phenotypes. This can result in the gradual evolution of populations towards a more optimal range of phenotypic variations for survival and reproduction.
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.
What are the two names of selection breeding?
The two main types of selective breeding are "natural selection" and "artificial selection." Natural selection occurs when organisms best adapted to their environment survive and reproduce naturally, while artificial selection involves human intervention to breed specific traits in plants or animals. Both methods aim to enhance desirable characteristics within a population.
How are selective breeding and natural selection similar?
Both selective breeding and natural selection involve the process of selecting specific traits to pass on to the next generation. In both cases, the environment plays a role in determining which traits are favored for survival and reproduction. The main difference is that selective breeding is a human-directed process, while natural selection occurs in the wild without human intervention.
Are natural selection and artificial selection opposites?
Natural selection and artificial selection are not opposites; rather, they are both mechanisms of selective breeding. Natural selection occurs in nature with environmental factors determining which traits are passed on to offspring, while artificial selection is guided by human intervention to produce specific desired traits in organisms. Both processes involve the differential survival and reproduction of individuals based on their inherited characteristics.
Which type of natural selection occurs when the extreme opposites in a phenotype range are selected?
Disruptive selection occurs when the extreme phenotypes in a population are favored over intermediate phenotypes. This can lead to the divergence of a population into two distinct groups with different traits.
Selection occurs when the environment continually eliminates extremes at both ends of a range of phenotypes?
Selection refers to the process by which certain traits become more or less common in a population over time, based on their impact on survival and reproductive success. In this case, the environment acts as the selective pressure by favoring intermediate phenotypes and reducing the presence of extreme phenotypes. This can result in the gradual evolution of populations towards a more optimal range of phenotypic variations for survival and reproduction.
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.
When does disruptive selection occur?
Disruptive selection occurs when there is selection against the heterozygous individual, causing the population of homozygous dominant and homozygous recessive individuals to increase, splitting the population into two groups corresponding to the dominant/recessive alleles.
Is a moth a selective breeding or a natural selection?
A moth can be a subject of both selective breeding and natural selection, depending on the context. In natural selection, moths may adapt to their environments over time, such as the famous case of the peppered moth, which changed color in response to pollution. Selective breeding, on the other hand, occurs when humans breed moths for specific traits, like color or size. Thus, the classification depends on whether the moth's traits are shaped by environmental pressures or human intervention.
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.
How do directional and disruptive selection differ in their impact on the evolution of a population?
Directional selection and disruptive selection are two types of natural selection that can drive evolution in a population. Directional selection occurs when individuals with a certain trait are favored over others, leading to a shift in the population towards that trait. This can result in the gradual evolution of the population towards that specific trait. Disruptive selection, on the other hand, occurs when individuals with extreme traits are favored over those with intermediate traits. This can lead to the population splitting into two distinct groups with different traits, potentially resulting in the evolution of two separate species. In summary, directional selection leads to a gradual shift towards a specific trait in a population, while disruptive selection can result in the divergence of a population into two distinct groups with different traits.
Which is not an example of selective breeding?
An example that is not selective breeding is natural selection, which occurs when environmental pressures lead to the survival and reproduction of individuals with favorable traits without human intervention. Additionally, random mating in a wild population, where individuals breed without regard to specific traits, is also not selective breeding. Selective breeding specifically involves humans intentionally choosing parent organisms based on desired traits to produce future generations.
What is the difference between selective breeding and natural selection?
In natural selection, the animals take time and evolve slowly. In selective breeding, humans can transfer genes from one organism into another organism.
Is artificial selection or selective breeding a good analogy for the selection that occurs in nature?
Yes, artificial selection or selective breeding can be a good analogy for the selection that occurs in nature through natural selection. Both processes involve the intentional or environmental selection of traits that are beneficial for survival and reproduction, leading to changes in populations over time.
What five conditions control that rate at which evolution occurs?
Generation time, mutation rate, asexual vs sexual reproduction, strength of selective pressures, population size
Why does natural selection occurs too be more quickly?
A lot of natural selection occurs very slowly. It took the evolution of the dog from the wolf to take at least 14,000 years. It took singled celled life 3+billion years to evolve into multicellular life.
