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Questions and Answers
What does the theory of evolution provide for biologists?
What does the theory of evolution provide for biologists?
- A method for categorizing species
- A timeline of Earth’s history
- A framework for understanding geology
- A unifying theory for biology (correct)
All living organisms have evolved from a common ancestor.
All living organisms have evolved from a common ancestor.
True (A)
What is adaptation in the context of evolution?
What is adaptation in the context of evolution?
The process by which organisms become better suited to their environment.
The _____ structures are features that are similar due to shared ancestry.
The _____ structures are features that are similar due to shared ancestry.
Match the type of evolution with its description:
Match the type of evolution with its description:
Which statement best represents a misconception about evolution?
Which statement best represents a misconception about evolution?
Convergent evolution results in species that increasingly resemble one another.
Convergent evolution results in species that increasingly resemble one another.
Name one example of a vestigial structure in modern organisms.
Name one example of a vestigial structure in modern organisms.
What is the term for when two species evolve in diverse directions from a common ancestor?
What is the term for when two species evolve in diverse directions from a common ancestor?
Convergent evolution occurs when different species evolve similar traits independently.
Convergent evolution occurs when different species evolve similar traits independently.
Name one example of a vestigial structure in organisms.
Name one example of a vestigial structure in organisms.
Fossils provide solid evidence that organisms from the past are not the same as those __________.
Fossils provide solid evidence that organisms from the past are not the same as those __________.
Which of the following is a result of natural selection acting on a population?
Which of the following is a result of natural selection acting on a population?
All similarities between species are due to homologous structures.
All similarities between species are due to homologous structures.
What does the presence of homologous structures suggest about different species?
What does the presence of homologous structures suggest about different species?
The __________ of an organism’s development provides evidence of relatedness among different species.
The __________ of an organism’s development provides evidence of relatedness among different species.
Which of these examples illustrates convergent evolution?
Which of these examples illustrates convergent evolution?
Natural selection can produce significant changes in a species' genotype within a single generation.
Natural selection can produce significant changes in a species' genotype within a single generation.
What are analogous structures?
What are analogous structures?
Match the following plant species with their features:
Match the following plant species with their features:
What do vestigial structures indicate about an organism?
What do vestigial structures indicate about an organism?
What does the theory of evolution primarily explain?
What does the theory of evolution primarily explain?
According to the theory of evolution, organisms can evolve intentionally to adapt to their environment.
According to the theory of evolution, organisms can evolve intentionally to adapt to their environment.
What molecule is mentioned as a mechanism of inheritance that plays a role in evolution?
What molecule is mentioned as a mechanism of inheritance that plays a role in evolution?
The presence of life on Earth means that the events that led to life cannot __________.
The presence of life on Earth means that the events that led to life cannot __________.
Match the following concepts with their descriptions:
Match the following concepts with their descriptions:
What is essential for natural selection to act upon in a population?
What is essential for natural selection to act upon in a population?
The resistance gene in bacteria arises as a direct result of applying antibiotics.
The resistance gene in bacteria arises as a direct result of applying antibiotics.
What factors determine which characteristics evolve in a species?
What factors determine which characteristics evolve in a species?
Evolution is not __________ directed and does not aim for improvement over time.
Evolution is not __________ directed and does not aim for improvement over time.
What misconception might arise regarding statements about evolution?
What misconception might arise regarding statements about evolution?
What term did Darwin use to describe the process of change in populations over generations?
What term did Darwin use to describe the process of change in populations over generations?
Natural selection is the only mechanism known for adaptive evolution.
Natural selection is the only mechanism known for adaptive evolution.
Who presented papers on natural selection at the Linnean Society in 1858?
Who presented papers on natural selection at the Linnean Society in 1858?
The ________ finch populations are a significant example of natural selection studied by the Grants.
The ________ finch populations are a significant example of natural selection studied by the Grants.
What caused the small-billed birds to survive during the El Niño event?
What caused the small-billed birds to survive during the El Niño event?
Genetic mutations can have effects with varying impacts on an organism's fitness.
Genetic mutations can have effects with varying impacts on an organism's fitness.
What are the two main mechanisms that contribute to genetic diversity in populations?
What are the two main mechanisms that contribute to genetic diversity in populations?
A heritable trait that enhances an organism's survival and reproduction is called an ________.
A heritable trait that enhances an organism's survival and reproduction is called an ________.
What is a possible outcome of a mutation on phenotype?
What is a possible outcome of a mutation on phenotype?
Match the organisms to their adaptations:
Match the organisms to their adaptations:
Large leaves were advantageous for plants in moist climates because they helped in energy absorption.
Large leaves were advantageous for plants in moist climates because they helped in energy absorption.
What effect did the improved conditions in 1987 have on the average bill size of finches?
What effect did the improved conditions in 1987 have on the average bill size of finches?
Genetic variation can occur through ________ and ________.
Genetic variation can occur through ________ and ________.
What type of biologist typically conducts research outdoors in natural habitats?
What type of biologist typically conducts research outdoors in natural habitats?
How does natural selection contribute to adaptation over time?
How does natural selection contribute to adaptation over time?
During early development, which structures are exhibited by all vertebrate embryos?
During early development, which structures are exhibited by all vertebrate embryos?
Marsupials are found worldwide due to their diversification in Australia.
Marsupials are found worldwide due to their diversification in Australia.
What does the theory of evolution describe?
What does the theory of evolution describe?
What mechanism of evolutionary change did Darwin and Wallace propose?
What mechanism of evolutionary change did Darwin and Wallace propose?
The geographic distribution of organisms is best explained by __________ in conjunction with tectonic plate movement.
The geographic distribution of organisms is best explained by __________ in conjunction with tectonic plate movement.
Georges-Louis Leclerc Comte de Buffon reintroduced the idea that species are static and unchanging.
Georges-Louis Leclerc Comte de Buffon reintroduced the idea that species are static and unchanging.
Who was a Scottish geologist that proposed gradual geological change?
Who was a Scottish geologist that proposed gradual geological change?
Match the following organisms with their respective unique locations:
Match the following organisms with their respective unique locations:
What is a common misconception about evolution?
What is a common misconception about evolution?
Darwin observed that giant tortoises with longer necks were better able to reach food during _______.
Darwin observed that giant tortoises with longer necks were better able to reach food during _______.
The theory of evolution has remained unchallenged since its proposal by Darwin.
The theory of evolution has remained unchallenged since its proposal by Darwin.
Match the contributors to evolutionary thought with their key ideas:
Match the contributors to evolutionary thought with their key ideas:
What happens to DNA sequences over time as organisms evolve?
What happens to DNA sequences over time as organisms evolve?
What did Darwin observe about the finches on the Galápagos Islands?
What did Darwin observe about the finches on the Galápagos Islands?
Natural selection leads to the increased reproduction of all individuals in a population equally.
Natural selection leads to the increased reproduction of all individuals in a population equally.
The regions that evolved after the breakup of Pangaea are typically found in __________ areas of the planet.
The regions that evolved after the breakup of Pangaea are typically found in __________ areas of the planet.
What do gene duplication events allow organisms to do?
What do gene duplication events allow organisms to do?
What is the term used to describe the survival and reproduction of individuals with favorable traits?
What is the term used to describe the survival and reproduction of individuals with favorable traits?
Evolution explains the origin of life itself.
Evolution explains the origin of life itself.
According to Darwin, most characteristics of organisms are ________ from parent to offspring.
According to Darwin, most characteristics of organisms are ________ from parent to offspring.
Match the principle of natural selection with its explanation:
Match the principle of natural selection with its explanation:
Why do some structures disappear in adult forms of terrestrial groups?
Why do some structures disappear in adult forms of terrestrial groups?
Individuals change due to _________ and __________, not due to evolution.
Individuals change due to _________ and __________, not due to evolution.
Which of the following statements most closely represents the concept of 'survival of the fittest'?
Which of the following statements most closely represents the concept of 'survival of the fittest'?
All species adaptively change over time according to environmental pressures.
All species adaptively change over time according to environmental pressures.
Match the following evolutionary mechanisms with their descriptions:
Match the following evolutionary mechanisms with their descriptions:
What did Thomas Malthus' essay contribute to Darwin's understanding of natural selection?
What did Thomas Malthus' essay contribute to Darwin's understanding of natural selection?
Lamarck’s theory involved the ________ of acquired characteristics as a means of evolutionary change.
Lamarck’s theory involved the ________ of acquired characteristics as a means of evolutionary change.
Match the figure with the observation made:
Match the figure with the observation made:
Flashcards
Evolution
Evolution
The process by which organisms change over time, driven by natural selection.
Adaptation
Adaptation
A trait that helps an organism survive and reproduce in its environment.
Convergent Evolution
Convergent Evolution
The development of similar traits in unrelated species due to similar environmental pressures.
Divergent Evolution
Divergent Evolution
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Homologous Structures
Homologous Structures
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Vestigial Structures
Vestigial Structures
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Speciation
Speciation
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Theory of Evolution
Theory of Evolution
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Plato's view on species
Plato's view on species
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Buffon's observation
Buffon's observation
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Hutton's gradualism
Hutton's gradualism
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Gradualism
Gradualism
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Lyell's contribution
Lyell's contribution
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Inheritance of Acquired Characteristics
Inheritance of Acquired Characteristics
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Lamarckism
Lamarckism
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Alfred Russel Wallace
Alfred Russel Wallace
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Darwin's Voyage
Darwin's Voyage
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Darwin's finches
Darwin's finches
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Natural selection
Natural selection
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Inheritance
Inheritance
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Overproduction
Overproduction
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Variation
Variation
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Differential Reproduction
Differential Reproduction
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Mutation
Mutation
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Genotype
Genotype
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Phenotype
Phenotype
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Fitness
Fitness
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Genetic Drift
Genetic Drift
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Gene Flow
Gene Flow
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Biogeography
Biogeography
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Embryonic Structures
Embryonic Structures
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Founder Effect
Founder Effect
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Species
Species
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Continental Drift
Continental Drift
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Endemic Species
Endemic Species
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Special Creation
Special Creation
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DNA's Universality
DNA's Universality
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Fossil
Fossil
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Fossil Record
Fossil Record
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Analogous Structures
Analogous Structures
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Embryology
Embryology
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Is Evolution Goal-Directed?
Is Evolution Goal-Directed?
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Variation is Pre-Existing
Variation is Pre-Existing
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Natural Selection on Pre-Living Entities
Natural Selection on Pre-Living Entities
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Natural Selection Works on Variation
Natural Selection Works on Variation
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Evolution is Not Intentional
Evolution is Not Intentional
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Populations Evolve, Not Individuals
Populations Evolve, Not Individuals
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Evolution Does Not Explain the Origin of Life
Evolution Does Not Explain the Origin of Life
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Study Notes
Evolution and the Origin of Species
- Organisms evolved from different species; evolution is an ongoing process.
- Evolution is the unifying theory of biology, providing a framework for questions about the living world. Dobzhansky stated that "nothing makes sense in biology except in the light of evolution."
- Natural selection, a mechanism of evolutionary change, was independently conceived by Darwin and Wallace.
- Natural selection ("survival of the fittest") describes the more prolific reproduction of individuals with favorable traits that enhance survival and reproduction in changing environments.
- Darwin's observations of species variation across Galápagos Island finches, giant tortoises, and other organisms, influenced his theory of natural selection.
- Natural selection is driven by three principles:
- Inheritance of characteristics from parent to offspring.
- More offspring are produced than can survive, leading to competition for resources.
- Variations in offspring characteristics, which are inherited.
- Darwin and Wallace presented papers on natural selection in 1858. Darwin's book "On the Origin of Species" followed.
- The Grants' studies of Galápagos finches provide evidence of natural selection.
- Adaptations are heritable traits that improve survival and reproduction in a given environment.
- Convergent evolution is the independent development of similar traits in distantly related species due to similar environmental pressures. (e.g., wings in bats and insects)
- Divergent evolution is the development of diverse traits in related species from a common ancestor. (e.g., reproductive organs in flowering plants)
Evidence of Evolution
- Fossils: Provide evidence of past and present organisms. Show progression. Fossil record reveals evolutionary history.
- Example: Fossil record documents human and horse evolution.
- Anatomy and Embryology
- Homologous structures: Similar bone structures in different species from a common ancestor. Evidence of descent from a common ancestor. (e.g., human, dog, bird, whale appendages) and similar development stages (embryos of different species)
- Vestigial structures: Structures with no apparent function, potentially remnants of ancestral structures. (e.g., wings of flightless birds and hind leg bones in whales)
- Analogous structures: Similar functions, but different structures and developmental origins suggesting analogous functions in different species (e.g., wings of insects and birds)
- Biogeography: Geographic distribution of organisms reflects evolution and plate movement. (e.g., unique flora and fauna of continents that were previously part of Pangaea)
- Molecular Biology: DNA's universality and relatedness reflect a common ancestor. DNA sequences show evolutionary relationships. (e.g., gene duplication events leading to new protein functions)
Misconceptions of Evolution
- Evolution is a scientifically tested and verified explanation of facts about living organisms, not a guess or hypothesis.
- Individuals do not evolve. Changes within individuals over lifetimes are development, not evolution. Evolution impacts average population characteristics over generations.
- Evolution does not explain life's origin. It explains adaptation and diversification of life forms.
- Evolution is not purposeful or goal-directed. Adaptations arise due to existing variation and environmental pressures.
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