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Questions and Answers
Which of the following best describes a population in the context of genetics and evolution?
Which of the following best describes a population in the context of genetics and evolution?
- Any group of organisms, regardless of species or location.
- Members of the same species living in the same area and able to reproduce fertile offspring. (correct)
- Members of different species living in the same area.
- Members of the same species living in different areas.
The gene pool of a population includes only the genes that are actively expressed as traits.
The gene pool of a population includes only the genes that are actively expressed as traits.
False (B)
What is the primary effect of natural selection on the gene pool of a population?
What is the primary effect of natural selection on the gene pool of a population?
changes in gene frequency
The introduction of new gene types into a gene pool is primarily due to ______.
The introduction of new gene types into a gene pool is primarily due to ______.
Match each factor with its primary effect on the gene pool:
Match each factor with its primary effect on the gene pool:
How does mutation contribute to the evolution of a population?
How does mutation contribute to the evolution of a population?
Gene flow always increases the genetic diversity within a population.
Gene flow always increases the genetic diversity within a population.
Define genetic drift and explain why it has a more significant impact on small populations.
Define genetic drift and explain why it has a more significant impact on small populations.
[Blank] is the movement of members of a species into or out of a population, changing the gene pool.
[Blank] is the movement of members of a species into or out of a population, changing the gene pool.
Which of the following scenarios exemplifies natural selection?
Which of the following scenarios exemplifies natural selection?
Mutation always leads to a beneficial change for the organism.
Mutation always leads to a beneficial change for the organism.
What is the role of isolation in the context of population genetics?
What is the role of isolation in the context of population genetics?
A change in the gene pool of a population due to chance is known as ______.
A change in the gene pool of a population due to chance is known as ______.
Which of the following is NOT a factor that changes the gene pool?
Which of the following is NOT a factor that changes the gene pool?
If a mutation helps an organism survive better in its environment, it is less likely to be passed on to the next generation.
If a mutation helps an organism survive better in its environment, it is less likely to be passed on to the next generation.
How does gene flow affect genetic variation between different populations of the same species?
How does gene flow affect genetic variation between different populations of the same species?
When a small group of individuals starts a new colony away from the original population, it can lead to ______, a form of genetic drift.
When a small group of individuals starts a new colony away from the original population, it can lead to ______, a form of genetic drift.
Which of the following scenarios would most likely lead to genetic drift?
Which of the following scenarios would most likely lead to genetic drift?
Isolation always leads to the formation of new species.
Isolation always leads to the formation of new species.
Explain how natural selection can lead to adaptation in a population.
Explain how natural selection can lead to adaptation in a population.
The collection of all genes and their alleles in a population is known as the ______.
The collection of all genes and their alleles in a population is known as the ______.
Why is genetic variation important for the survival of a population?
Why is genetic variation important for the survival of a population?
Genetic drift increases genetic variation within a small population.
Genetic drift increases genetic variation within a small population.
How can mutations be both beneficial and harmful in the context of evolution?
How can mutations be both beneficial and harmful in the context of evolution?
The process by which organisms that are better adapted to their environment survive and reproduce more successfully is known as ______.
The process by which organisms that are better adapted to their environment survive and reproduce more successfully is known as ______.
Flashcards
Population
Population
Members of the same species living in the same area and able to reproduce fertile offspring.
Gene Pool
Gene Pool
The collection of all genes for all traits in a population.
Changes in the Gene Pool
Changes in the Gene Pool
A change in the frequency of genes in a population due to the selection of traits.
Natural Selection
Natural Selection
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Mutation
Mutation
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Gene Flow (Migration)
Gene Flow (Migration)
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Genetic Drift
Genetic Drift
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Isolation
Isolation
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Study Notes
- A population comprises members of the same species living in the same area and capable of producing fertile offspring.
Gene Pool
- The gene pool encompasses all the genes for all traits within a population.
- Changes in the gene pool occur due to the selection of traits.
Factors that Change the Gene Pool
- These factors include natural selection, mutation, gene flow (migration), genetic drift, and isolation.
Natural Selection
- Well-adapted organisms survive and pass on their genes, altering gene frequencies across generations.
Mutation
- Mutation introduces new gene types into the gene pool, which can be either helpful or harmful.
- Helpful mutations enhance an organism's survival and are passed on to subsequent generations.
Gene Flow (Migration)
- Gene flow involves the movement of species members into or out of a population.
Genetic Drift
- Genetic drift refers to changes in a population due to the frequency of particular genes.
- It occurs by chance when individuals die or fail to reproduce.
- Genetic drift has a more significant impact on small populations.
Isolation
- Isolation involves the separation of a species.
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