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When environmental conditions favor individuals at one extreme of the normal distribution?
When environmental conditions favor individuals at one extreme of the normal distribution, it can lead to a phenomenon known as directional selection. This type of selection increases the frequency of traits that enhance survival and reproduction in that specific extreme, potentially reducing genetic diversity. Over time, this can result in evolutionary changes within the population, as traits that are advantageous become more prevalent. Ultimately, the population may adapt to the new environmental conditions, shifting the overall distribution of traits.
Why would stabilizing selection change the shape of a graph of phenotypes?
Stabilizing selection favors individuals with traits that are average or intermediate, reducing the frequency of extreme phenotypes. As a result, the distribution of phenotypes shifts towards the mean, leading to a narrower and taller bell-shaped curve on the graph. This change indicates a decrease in phenotypic variation, as the extremes are selected against, promoting a more uniform population. Over time, this stabilizing effect can enhance the fitness of the population in a stable environment.
What is obtained by dividing the population into groups and selecting all individuals from within a random sample of the groups?
This method is known as cluster sampling. In cluster sampling, the entire population is divided into clusters, often based on geographical areas or other natural groupings. Then, a random selection of these clusters is made, and all individuals within the selected clusters are included in the sample. This approach can be more practical and cost-effective than other sampling methods, especially when the population is large and dispersed.
What is independent values?
sample data drawn from one population is completely unrelated to the selection of sample data from the other population.
What is a selection that eliminates individuals on both ends of the range and favors those in the middle?
One standard deviation.
What is a change in the frequency of a particular gene in one direction in a population called?
A change in the frequency of a particular gene in one direction in a population is called genetic drift. Genetic drift refers to the random fluctuation of allele frequencies in a population over time, leading to a change in the genetic composition of the population.
When selection causes the frequency of a particular trair to move in one direction?
Directional Selection
How can national selection change the frequency of traits in a population?
National selection can change the frequency of traits in a population by favoring certain traits that provide a survival or reproductive advantage. Over time, individuals with these advantageous traits are more likely to survive and pass their genes on to the next generation, leading to an increase in the frequency of those traits in the population. Conversely, traits that are not advantageous may decrease in frequency or be selected against.
When a population undergoes strong selection what happens to it?
When a population undergoes strong selection, individuals with advantageous traits are more likely to survive and reproduce, leading to an increase in the frequency of those traits within the population. This can result in rapid evolutionary changes as the population adapts to its environment.
Natural selection requires that individuals in a population are?
Natural selection requires that individuals in a population are
What are the different ways in which individuals with a particular trait may increase in a population?
different ways in which individuals with particular trait may increase are -if that particular trait provides them with some sort of support to undergo the circumstances they are found in, we can also call it natural selection -or due to any genetic drift, that is a natural calamity, also called a chance selection
What is a population that changes over time due to natural selection?
A population of organisms that changes over time due to natural selection is called a evolving population. Through natural selection, individuals with traits that are better suited to their environment tend to survive and reproduce, leading to changes in the frequency of traits within the population over generations.
What is most likely cause of directional selection?
The most likely cause of directional selection is a shift in environmental conditions that favors individuals with a particular extreme trait over others. This can lead to the gradual increase in frequency of that trait in a population over time.
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.
Does the process of evolution occur at the individual level, where selection happens to individuals, or at the population level, where selection happens to populations?
Evolution occurs at the population level, where selection happens to populations rather than individuals.
Why selection is called negative source?
Selection is called a negative source because it acts by removing individuals with unfavorable traits from the population. This process reduces the frequency of those traits in subsequent generations, effectively "negating" their presence. Negative selection helps to eliminate harmful traits and promote survival of individuals with beneficial traits.
What effect does natural selection have on the allele frequency of a population?
In the next generation that trait increases in frequency above the frequency in the current generation.
