Evolutionary Biology Quiz

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Questions and Answers

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.

True (A)

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.

<p>homologous</p> Signup and view all the answers

Match the type of evolution with its description:

<p>Convergent evolution = Different species evolve similar traits Divergent evolution = Related species become more dissimilar Vestigial structures = Remnants of structures that had a function in ancestors Natural selection = Mechanism by which species change over time</p> Signup and view all the answers

Which statement best represents a misconception about evolution?

<p>All traits of organisms are adaptations. (C)</p> Signup and view all the answers

Convergent evolution results in species that increasingly resemble one another.

<p>True (A)</p> Signup and view all the answers

Name one example of a vestigial structure in modern organisms.

<p>Human appendix</p> Signup and view all the answers

What is the term for when two species evolve in diverse directions from a common ancestor?

<p>Divergent evolution (D)</p> Signup and view all the answers

Convergent evolution occurs when different species evolve similar traits independently.

<p>True (A)</p> Signup and view all the answers

Name one example of a vestigial structure in organisms.

<p>Hind leg bones in whales</p> Signup and view all the answers

Fossils provide solid evidence that organisms from the past are not the same as those __________.

<p>today</p> Signup and view all the answers

Which of the following is a result of natural selection acting on a population?

<p>Diversity in form and function (C)</p> Signup and view all the answers

All similarities between species are due to homologous structures.

<p>False (B)</p> Signup and view all the answers

What does the presence of homologous structures suggest about different species?

<p>They share a common ancestor.</p> Signup and view all the answers

The __________ of an organism’s development provides evidence of relatedness among different species.

<p>embryology</p> Signup and view all the answers

Which of these examples illustrates convergent evolution?

<p>Bats and birds having wings (B)</p> Signup and view all the answers

Natural selection can produce significant changes in a species' genotype within a single generation.

<p>False (B)</p> Signup and view all the answers

What are analogous structures?

<p>Structures that serve similar functions but evolved independently.</p> Signup and view all the answers

Match the following plant species with their features:

<p>Dense blazing star = Adapts to specific pollinators Purple coneflower = Shares basic morphology with different adaptations</p> Signup and view all the answers

What do vestigial structures indicate about an organism?

<p>The organism has lost the function of those structures from ancestors. (D)</p> Signup and view all the answers

What does the theory of evolution primarily explain?

<p>How populations change over time (A)</p> Signup and view all the answers

According to the theory of evolution, organisms can evolve intentionally to adapt to their environment.

<p>False (B)</p> Signup and view all the answers

What molecule is mentioned as a mechanism of inheritance that plays a role in evolution?

<p>DNA</p> Signup and view all the answers

The presence of life on Earth means that the events that led to life cannot __________.

<p>repeat themselves</p> Signup and view all the answers

Match the following concepts with their descriptions:

<p>Natural selection = Process where certain traits increase survival and reproduction Genetic variation = Differences in DNA among individuals within a population Antibiotic resistance = Ability of bacteria to survive despite antibiotic treatment Evolution = Change in the genetic composition of populations over time</p> Signup and view all the answers

What is essential for natural selection to act upon in a population?

<p>Genetic variation (D)</p> Signup and view all the answers

The resistance gene in bacteria arises as a direct result of applying antibiotics.

<p>False (B)</p> Signup and view all the answers

What factors determine which characteristics evolve in a species?

<p>Variation present and environment</p> Signup and view all the answers

Evolution is not __________ directed and does not aim for improvement over time.

<p>goal</p> Signup and view all the answers

What misconception might arise regarding statements about evolution?

<p>Individuals evolve quickly (A)</p> Signup and view all the answers

What term did Darwin use to describe the process of change in populations over generations?

<p>Descent with modification (A)</p> Signup and view all the answers

Natural selection is the only mechanism known for adaptive evolution.

<p>True (A)</p> Signup and view all the answers

Who presented papers on natural selection at the Linnean Society in 1858?

<p>Charles Darwin and Alfred Wallace</p> Signup and view all the answers

The ________ finch populations are a significant example of natural selection studied by the Grants.

<p>Galápagos</p> Signup and view all the answers

What caused the small-billed birds to survive during the El Niño event?

<p>Abundance of small soft seeds (C)</p> Signup and view all the answers

Genetic mutations can have effects with varying impacts on an organism's fitness.

<p>True (A)</p> Signup and view all the answers

What are the two main mechanisms that contribute to genetic diversity in populations?

<p>Mutation and sexual reproduction</p> Signup and view all the answers

A heritable trait that enhances an organism's survival and reproduction is called an ________.

<p>adaptation</p> Signup and view all the answers

What is a possible outcome of a mutation on phenotype?

<p>Neutral, beneficial, or harmful (A)</p> Signup and view all the answers

Match the organisms to their adaptations:

<p>Platypus = Webbed feet for swimming Snow leopard = Thick fur for cold environments Cheetah = Fast speed for hunting Cactus = Water-storing ability</p> Signup and view all the answers

Large leaves were advantageous for plants in moist climates because they helped in energy absorption.

<p>True (A)</p> Signup and view all the answers

What effect did the improved conditions in 1987 have on the average bill size of finches?

<p>The trend toward smaller average bill size ceased.</p> Signup and view all the answers

Genetic variation can occur through ________ and ________.

<p>mutation, sexual reproduction</p> Signup and view all the answers

What type of biologist typically conducts research outdoors in natural habitats?

<p>Field biologist (C)</p> Signup and view all the answers

How does natural selection contribute to adaptation over time?

<p>It favors individuals with traits that enhance survival and reproduction.</p> Signup and view all the answers

During early development, which structures are exhibited by all vertebrate embryos?

<p>Gill slits and tails (C)</p> Signup and view all the answers

Marsupials are found worldwide due to their diversification in Australia.

<p>False (B)</p> Signup and view all the answers

What does the theory of evolution describe?

<p>A body of thoroughly tested and verified explanations for a set of observations about the natural world.</p> Signup and view all the answers

What mechanism of evolutionary change did Darwin and Wallace propose?

<p>Natural selection (A)</p> Signup and view all the answers

The geographic distribution of organisms is best explained by __________ in conjunction with tectonic plate movement.

<p>evolution</p> Signup and view all the answers

Georges-Louis Leclerc Comte de Buffon reintroduced the idea that species are static and unchanging.

<p>False (B)</p> Signup and view all the answers

Who was a Scottish geologist that proposed gradual geological change?

<p>James Hutton</p> Signup and view all the answers

Match the following organisms with their respective unique locations:

<p>Marsupials = Australia Galápagos finches = Galápagos Islands Proteaceae = Southern Africa Unique flora = Northern continents</p> Signup and view all the answers

What is a common misconception about evolution?

<p>Individuals evolve over their lifetime. (A)</p> Signup and view all the answers

Darwin observed that giant tortoises with longer necks were better able to reach food during _______.

<p>drought</p> Signup and view all the answers

The theory of evolution has remained unchallenged since its proposal by Darwin.

<p>False (B)</p> Signup and view all the answers

Match the contributors to evolutionary thought with their key ideas:

<p>Charles Darwin = Natural selection Jean-Baptiste Lamarck = Inheritance of acquired characteristics James Hutton = Gradual geological change Alfred Russel Wallace = Independent formulation of natural selection</p> Signup and view all the answers

What happens to DNA sequences over time as organisms evolve?

<p>DNA sequences diverge and reflect evolutionary changes.</p> Signup and view all the answers

What did Darwin observe about the finches on the Galápagos Islands?

<p>Their beak shapes correlated with their food sources. (A)</p> Signup and view all the answers

Natural selection leads to the increased reproduction of all individuals in a population equally.

<p>False (B)</p> Signup and view all the answers

The regions that evolved after the breakup of Pangaea are typically found in __________ areas of the planet.

<p>unique</p> Signup and view all the answers

What do gene duplication events allow organisms to do?

<p>Create new functions for proteins. (D)</p> Signup and view all the answers

What is the term used to describe the survival and reproduction of individuals with favorable traits?

<p>Natural selection</p> Signup and view all the answers

Evolution explains the origin of life itself.

<p>False (B)</p> Signup and view all the answers

According to Darwin, most characteristics of organisms are ________ from parent to offspring.

<p>inherited</p> Signup and view all the answers

Match the principle of natural selection with its explanation:

<p>Inheritance = Characteristics are passed from parent to offspring Overproduction = More offspring are produced than can survive Variation = Differences among offspring give competitive advantages Competition = Limited resources lead to struggle for survival</p> Signup and view all the answers

Why do some structures disappear in adult forms of terrestrial groups?

<p>Because they are not needed for survival due to changes in environment or lifestyle.</p> Signup and view all the answers

Individuals change due to _________ and __________, not due to evolution.

<p>development, environment</p> Signup and view all the answers

Which of the following statements most closely represents the concept of 'survival of the fittest'?

<p>Individuals with traits suited to their environment are more likely to survive and reproduce. (A)</p> Signup and view all the answers

All species adaptively change over time according to environmental pressures.

<p>True (A)</p> Signup and view all the answers

Match the following evolutionary mechanisms with their descriptions:

<p>Natural Selection = Differential survival based on traits Mutation = Change in DNA sequence Genetic Drift = Random changes in allele frequencies Gene Flow = Transfer of genetic material between populations</p> Signup and view all the answers

What did Thomas Malthus' essay contribute to Darwin's understanding of natural selection?

<p>The concept of competition for limited resources among organisms.</p> Signup and view all the answers

Lamarck’s theory involved the ________ of acquired characteristics as a means of evolutionary change.

<p>inheritance</p> Signup and view all the answers

Match the figure with the observation made:

<p>Giant tortoises = Long-necked for reaching food Galápagos finches = Varied beak shapes for different food sources South American finches = Similar but distinct from Galápagos species Evolutionary change = Result of natural selection over time</p> Signup and view all the answers

Flashcards

Evolution

The process by which organisms change over time, driven by natural selection.

Adaptation

A trait that helps an organism survive and reproduce in its environment.

Convergent Evolution

The development of similar traits in unrelated species due to similar environmental pressures.

Divergent Evolution

The development of different traits in related species due to different environmental pressures.

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Homologous Structures

Structures in different species that have similar underlying anatomy but different functions, suggesting common ancestry.

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Vestigial Structures

Structures that once served a purpose in an ancestor but are now reduced or non-functional.

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Speciation

The process by which a new species arises from an existing species.

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Theory of Evolution

The unifying theory of biology, explaining the diversity and relatedness of life on Earth.

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Plato's view on species

Ancient Greek philosopher who believed species were static and unchanging.

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Buffon's observation

Eighteenth-century naturalist who observed that different regions have unique plant and animal life, even with similar environments.

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Hutton's gradualism

Scottish geologist who proposed that geological change happens gradually over long periods.

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Gradualism

The idea that geological change occurs through the accumulation of small changes over time.

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Lyell's contribution

Nineteenth-century geologist who popularized Hutton's view of gradualism.

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Inheritance of Acquired Characteristics

The mechanism proposed by Lamarck, stating that acquired characteristics are passed down to offspring.

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Lamarckism

The idea that changes in an organism's lifetime, like muscle growth, are passed on to offspring.

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Alfred Russel Wallace

A naturalist who independently developed the theory of natural selection alongside Darwin.

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Darwin's Voyage

Darwin's journey on the H.M.S. Beagle to study the natural world.

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Darwin's finches

Unique variations in beak shape among finches on the Galápagos Islands.

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Natural selection

The process by which organisms with traits best suited for their environment survive and reproduce more successfully.

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Inheritance

The principle that organisms inherit traits from their parents.

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Overproduction

The idea that organisms produce more offspring than resources can support, leading to competition.

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Variation

Variations in traits among individuals within a population.

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Differential Reproduction

The principle that organisms with advantageous traits are more likely to survive and reproduce.

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Mutation

The process by which new genetic variations arise, the ultimate source of new alleles.

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Genotype

The combination of alleles an organism inherits from its parents.

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Phenotype

The physical characteristics or traits of an organism.

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Fitness

A measure of an organism's reproductive success, its ability to survive and produce offspring.

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Genetic Drift

A change in the frequency of alleles in a population over time.

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Gene Flow

The exchange of genetic material between populations, increasing genetic diversity.

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Biogeography

The study of the geographic distribution of organisms on Earth.

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Embryonic Structures

Structures present in an embryo but absent in the adult form of some species.

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Founder Effect

Evolutionary changes that occur due to the physical separation of populations.

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Species

A group of organisms that share a common ancestor and can interbreed.

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Continental Drift

The breaking apart of a supercontinent, leading to the isolation and diversification of species.

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Endemic Species

Unique species found only in a specific geographic area.

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Special Creation

The theory that species are unchanging and were created separately.

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DNA's Universality

The universality of DNA suggests a common ancestor for all life.

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Fossil

Any preserved remnant or trace of ancient life, providing concrete evidence of past organisms.

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Fossil Record

The study of the chronological arrangement of fossils, revealing how life forms changed over time.

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Analogous Structures

Structures that appear similar in different species but evolved independently, not due to common ancestry.

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Embryology

The study of the development of an organism from its initial stages to its adult form.

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Is Evolution Goal-Directed?

The idea that evolution is not directed towards a specific goal, and species don't necessarily become "better" over time, they simply adapt to their changing environment.

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Variation is Pre-Existing

A gene's influence on the trait is already present in the population. The environment doesn't create a new trait, it just favors already existing ones.

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Natural Selection on Pre-Living Entities

These entities would be subject to natural selection, with more effective reproducers increasing in frequency.

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Natural Selection Works on Variation

Natural selection works on pre-existing variation within a population. It does not create new traits, but rather favors already existing ones.

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Evolution is Not Intentional

The evolution of a population does not occur in an intentional manner. The changes are driven by the environment selecting for advantageous traits, not by conscious effort.

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Populations Evolve, Not Individuals

The statement "organisms evolve in response to a change in an environment" is often misinterpreted. It's not individuals evolving, but populations.

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Evolution Does Not Explain the Origin of Life

Evolutionary theory does not address the origin of life; it explains how life diversified.

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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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