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Questions and Answers
What does the concept of evolution primarily describe?
What does the concept of evolution primarily describe?
Which of the following provides evidence for evolution?
Which of the following provides evidence for evolution?
What is biodiversity primarily defined as?
What is biodiversity primarily defined as?
Natural selection is best described as?
Natural selection is best described as?
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Which statement most accurately captures the Darwinian Revolution's impact on our understanding of Earth’s history?
Which statement most accurately captures the Darwinian Revolution's impact on our understanding of Earth’s history?
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What does biodiversity encompass at its broadest level?
What does biodiversity encompass at its broadest level?
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Which aspect of biodiversity is often harmed by poor land management and climate change?
Which aspect of biodiversity is often harmed by poor land management and climate change?
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Which statement accurately reflects a characteristic of evolution?
Which statement accurately reflects a characteristic of evolution?
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What role do variations in traits play in the evolution of a population?
What role do variations in traits play in the evolution of a population?
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Which example illustrates the impact of biodiversity on organism characteristics?
Which example illustrates the impact of biodiversity on organism characteristics?
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What consequence does reduced soil biodiversity have on human health?
What consequence does reduced soil biodiversity have on human health?
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What is necessary for evolution to occur?
What is necessary for evolution to occur?
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What misconception is commonly held regarding the process of evolution?
What misconception is commonly held regarding the process of evolution?
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What is the key characteristic of natural selection?
What is the key characteristic of natural selection?
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Which of the following statements about evolutionary traits is correct?
Which of the following statements about evolutionary traits is correct?
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What result does the unequal survival and reproduction of individuals lead to?
What result does the unequal survival and reproduction of individuals lead to?
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Why is it incorrect to state that individuals evolve?
Why is it incorrect to state that individuals evolve?
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Which example illustrates natural selection correctly?
Which example illustrates natural selection correctly?
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Which aspect distinguishes artificial selection from natural selection?
Which aspect distinguishes artificial selection from natural selection?
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What role does the environment play in the process of natural selection?
What role does the environment play in the process of natural selection?
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How is evolution defined in the context of both a pattern and a process?
How is evolution defined in the context of both a pattern and a process?
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What is a misconception about traits and inheritance in evolution?
What is a misconception about traits and inheritance in evolution?
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What concept does natural selection primarily involve?
What concept does natural selection primarily involve?
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Which of the following statements accurately reflects the ongoing debate regarding evolution?
Which of the following statements accurately reflects the ongoing debate regarding evolution?
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What was a primary belief held by both Plato and Aristotle regarding species?
What was a primary belief held by both Plato and Aristotle regarding species?
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Which scientist contributed to the notion of catastrophism in evolutionary theory?
Which scientist contributed to the notion of catastrophism in evolutionary theory?
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How does uniformitarianism contribute to the understanding of geological processes?
How does uniformitarianism contribute to the understanding of geological processes?
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What does the consistency of fossil order in strata suggest about extinct taxa?
What does the consistency of fossil order in strata suggest about extinct taxa?
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Which of the following statements best characterizes the relationship between evolution and religion/spirituality?
Which of the following statements best characterizes the relationship between evolution and religion/spirituality?
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Why is it incorrect to say that lions evolved big teeth in order to kill and eat big prey?
Why is it incorrect to say that lions evolved big teeth in order to kill and eat big prey?
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What does the presence of variation in teeth among lions suggest about their evolution?
What does the presence of variation in teeth among lions suggest about their evolution?
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How does environmental change impact the evolution of species like the soapberry bug?
How does environmental change impact the evolution of species like the soapberry bug?
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What critical concept did Darwin draw from geologists Hutton and Lyell regarding Earth's age?
What critical concept did Darwin draw from geologists Hutton and Lyell regarding Earth's age?
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What is a defining characteristic of natural selection?
What is a defining characteristic of natural selection?
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Which statement reflects Lamarck's view on evolution?
Which statement reflects Lamarck's view on evolution?
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Which of the following is NOT true regarding mutations in organisms?
Which of the following is NOT true regarding mutations in organisms?
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What does the concept of fitness primarily relate to in evolutionary terms?
What does the concept of fitness primarily relate to in evolutionary terms?
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What does the theory of evolution combine to create its framework?
What does the theory of evolution combine to create its framework?
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When natural selection favors increased beak length in a population, what underlying factor is at play?
When natural selection favors increased beak length in a population, what underlying factor is at play?
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In the context of natural selection, which of the following statements is true?
In the context of natural selection, which of the following statements is true?
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What is the role of genetic mutations in the context of evolution?
What is the role of genetic mutations in the context of evolution?
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What is an example of an adaptation?
What is an example of an adaptation?
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What does the phrase 'descent with modification' imply?
What does the phrase 'descent with modification' imply?
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What evidence did Darwin observe in Galápagos finches to support natural selection?
What evidence did Darwin observe in Galápagos finches to support natural selection?
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Which of the following describes a situation where an individual can exhibit high levels of fitness?
Which of the following describes a situation where an individual can exhibit high levels of fitness?
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Flashcards
Biodiversity
Biodiversity
The diversity of life forms in an ecosystem, from genes to ecosystems.
Soil Biodiversity
Soil Biodiversity
The variety of living organisms found in soil, crucial for ecosystem health.
Evolution
Evolution
Descent with modification; the process through which species adapt over time.
Impact of Poor Land Management
Impact of Poor Land Management
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Natural Selection
Natural Selection
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Ecosystem Services
Ecosystem Services
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Phylogenetic Trees
Phylogenetic Trees
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Characteristics of Biodiversity
Characteristics of Biodiversity
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Evolution
Evolution
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Fossil Record
Fossil Record
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Variation in Traits
Variation in Traits
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Population in Evolution
Population in Evolution
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Favorable Traits
Favorable Traits
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Inherited Traits
Inherited Traits
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Evolution by Natural Selection
Evolution by Natural Selection
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Artificial Selection
Artificial Selection
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Environmental Context
Environmental Context
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Individuals vs. Populations
Individuals vs. Populations
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Heritable Traits
Heritable Traits
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Darwin's Influence
Darwin's Influence
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Evolutionary Goals
Evolutionary Goals
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Fitness in Evolution
Fitness in Evolution
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Lamarck's Theory
Lamarck's Theory
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What is Fitness?
What is Fitness?
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Environmental Change
Environmental Change
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Galápagos Finches
Galápagos Finches
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Soapberry Bug Example
Soapberry Bug Example
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Adaptations
Adaptations
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Descent with Modification
Descent with Modification
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Theory of Evolution
Theory of Evolution
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Four Principles of Natural Selection
Four Principles of Natural Selection
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Adaptive Traits
Adaptive Traits
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Evolution as a pattern
Evolution as a pattern
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Evolution as a process
Evolution as a process
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Catastrophism
Catastrophism
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Gradualism
Gradualism
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Uniformitarianism
Uniformitarianism
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Inter-specific variation
Inter-specific variation
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Study Notes
Unit 1: Evolution and Biodiversity
- Evolution, phylogenetic trees, evolution of populations, origin of species, and history of life are discussed
- Biodiversity of bacteria, archaea, protists, fungi, and plants are included
Show and Tell
- A photo of a praying mantis on an orchid is shown
Today's Topic: Evolution- Descent with modification (Ch. 22)
- The topic is evolution, specifically descent with modification
- Images of ladybugs and a collage of various insects are included
- Chapter 22 is highlighted
Synopsis for today
- Understanding patterns in biodiversity
- Explaining natural and artificial selection
- Understanding evolution
Evolution: descent with modification
- The Darwinian revolution challenged traditional views of a young Earth.
- Descent with modification by natural selection explains the adaptations and unity/diversity of life.
- Evolution is supported by overwhelming evidence including the fossil record, homologies, direct observations, and molecular DNA data.
What is Biodiversity?
- Biological diversity is the variation of life at all levels of biological organization
- Biodiversity refers to the total of life forms across an area, including the range of differences between those forms
- It encompasses genetic diversity within populations and variety of ecosystems globally.
Biodiversity and Human Health
- Health is defined as complete physical, mental, and social well-being
- Biodiversity is critical to ecosystem functioning and essential to human health & well-being
- Biodiversity and human health are interlinked
Soil Biodiversity & Human Health
- Soil biodiversity is often negatively impacted by poor land management and climate change
- Important for human health via pest and pathogen control, nutritious food, and clean water/air
Observations About Biodiversity
- Rich biodiversity exists in nature with varied patterns, and shared characteristics
- Organisms are suited to local environments
- Variations in organisms, such as body size, bill size, bill shape, diet, and vocalizations, are seen
Observation About Biodiversity
- Shared characteristics among different species demonstrate the unity of life
- Different species show differing characteristics, such as size, shape, and color
What is Evolution?
- Evolution is defined as change in genetic composition (allele frequencies) of a population over generations.
- Variation in traits is associated with evolution.
- Populations are the smallest entities capable of evolving and changes occur over time
What Is Evolution?
- Evolution is viewed as pattern (& process)
- Scientific data reveals life's evolution over time
- Mechanisms cause these evolutionary changes
Evolution: Fact or Fiction?
- Natural selection causes population changes over time via allele frequency changes.
- Written and geological records have shown changes in organisms over time.
- Change in allele frequencies over time lead to changes in phenotypic frequencies.
- Mechanisms of evolution in events are still discussed and investigated
EVOLUTION
- Evolution is a fact with well-established general mechanisms
- Mechanisms are still being studied and debated with new models beyond traditional views
- Evolution and religion/spirituality are not mutually exclusive
Origins of Evolutionary Theory
- Plato and Aristotle believed in an unchanging linear ladder of life with humans at the top.
- Natural theology (1700s-1800s) sought to understand the creator's plan through nature, with Linnaeus contributing binomial nomenclature.
Origins of Evolutionary Theory
- Georges Cuvier, a paleontologist, observed extinctions and proposed catastrophism.
- James Hutton and Charles Lyell - proposed gradualism and uniformitarianism, supporting the Earth's great age
Origins of Evolutionary Theory
- Fossils of extinct taxa are found in a consistent order in strata from older to younger
Origins of Evolutionary Theory
- Darwin, influenced by geologists, recognized the Earth's vast age and slow processes of change.
- Darwin observed diverse species around the world
- Darwin developed observations related to Malthus's population growth
Origins of Evolutionary Theory: Lamarck
- Individuals match environments with acquired traits but do not pass traits to offspring
- Organisms have a drive for more complexity, which is untrue
- Traits change due to use and disuse
Voyage of the Beagle (1831-1836)
- Charles Darwin's voyage on the HMS Beagle
Galápagos Finches
- Varied beak shapes match varied food sources
- Beak shapes are inherited adaptations to promote survival and reproduction, a result of natural selection for suitable traits
What is Fitness?
- Fitness is the contribution of an individual to the gene pool of the next generation based on other individuals
- The fittest individual has the highest proportion of alleles in future generations
- Individuals who reproduce but die young can still have high fitness
Adaptations
- Inherited traits assisting individuals in survival & reproduction, enhancing fitness are adaptations.
- Examples include salt-limiting glands, oil-secreting glands, streamlined bodies, and webbed feet.
Descent With Modification
- Common ancestor for elephants and hyraxes is shown on the tree diagram.
- Extinct species are labeled.
- Extant (living) species are listed together with ages (time from common ancestor)
Natural Selection: Darwin
- Traits vary within populations
- Traits are inherited from parents
- Species commonly produce more offspring than the environment can sustain
- Limited resources lead to death among many offspring
Inferences From Darwin's Theory
- Individuals inheriting traits for higher survival/reproduction tend to have more offspring
- This unequal ability will lead to increased presence of beneficial traits within populations
Natural Selection
- Examples of canine species and their ancestral connections over millions of years illustrate natural selection.
Evolution by Natural Selection
- Traits vary within a population
- Traits are inherited from parents to offspring
- Individuals differ in reproductive output
Artificial Selection
- Artificial selection differs from natural selection
- How artificial and natural selection are similar
Natural Selection: Key Points
- Individuals do not evolve, but populations do.
- Natural selection acts on heritable traits (acquired traits are not heritable).
Natural Selection: Key Points
- Favorable traits depend on environmental context
- Natural selection is not goal-directed
Is this statement correct?
- The statement "Lions evolved big teeth in order to kill and eat big prey" is incorrect
There is no "goal"
- Natural selection works through differential survival/reproduction of individuals with suitable traits
Instead, think…
- Big teeth are a predominant trait in lion populations due to increased fitness
- Variation in teeth already existed and natural selection favored increased size
Do antibiotics cause bacteria to become resistant?
- Antibiotics do not cause antibiotic resistance but rather select for those bacteria already harboring resistance mechanisms.
Environmental Change & Evolution
- Environmental change can lead to evolution through natural selection when favorable traits are favored.
- If food sources change from balloon vine to goldenrain tree, bugs with beaks adapted to the goldenrain tree seeds will have a greater chance of survival and reproduction.
Environmental Change & Evolution (continued)
- How beak length has changed can be explained through natural selection
Theory of Evolution
- Evidence for evolution: observed patterns and hypothesized mechanisms
- Theories are rigorously tested unifying concepts; still subject to revision based on new evidence
- Evolution is the unifying theory in biology
Evolution: descent with modification
- The Darwinian revolution contested the traditional idea of a static earth with unchanging life.
- Descent with modification via natural selection explains the adaptations and diversity of life.
- Evidence supporting evolution is extensive encompassing the fossil record, homologous structures, direct observations, and molecular (DNA) data.
Next: The Evolution of Populations & Origin of Species
- Evolution involves changing allele frequencies in a population over time, as illustrated by changing mouse population distributions
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Description
This quiz explores fundamental concepts of evolution and biodiversity, including definitions, evidence for evolution, and the impact of natural selection. Test your understanding of how these concepts relate to Earth's history and human health.