Evolution: The Evidence
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Questions and Answers

What can be inferred about fossils found in different parts of the world?

  • They are only found in museums.
  • They provide evidence about the environment in which the organism existed. (correct)
  • They are all from the same species.
  • They are all from the same time period.

    • What is the significance of Archaeopteryx in understanding evolution?

  • It is a species that has remained unchanged for millions of years.
  • It is a fossil of a dinosaur.
  • It is a fossil of a modern bird.
  • It is an example of a transitional fossil. (correct)

    • What is biogeography?

  • The study of the characteristics of different species.
  • The study of the fossils found in different parts of the world.
  • The study of the evolution of organisms over time.
  • The study of the geographic distribution of organisms around the world. (correct)

    • What is the primary evidence that fossils provide for evolution?

    <p>The change in life forms over time</p> Signup and view all the answers

    What is the term for body parts that are similar in structure but different in function?

    <p>Homologous structures.</p> Signup and view all the answers

    What can be determined by comparing fossils from older rock layers with fossils from younger rock layers?

    <p>That life on Earth has changed over time</p> Signup and view all the answers

    What is the term for structures that seem to be 'left over' from a previous ancestor?

    <p>Vestigial organs.</p> Signup and view all the answers

    What is the difference between relative age and absolute age?

    <p>Relative age is the age in relation to other objects, while absolute age is the actual age</p> Signup and view all the answers

    What is the study of embryos and their development called?

    <p>Embryology.</p> Signup and view all the answers

    What can be learned from fossils found in adjacent layers?

    <p>They are more similar to each other than to fossils from deeper or higher layers</p> Signup and view all the answers

    What is determined by measuring the amount of a particular radioactive isotope in a fossil?

    <p>The absolute age of the fossil</p> Signup and view all the answers

    What do fossils of extinct organisms show?

    <p>That past organisms differed from present-day organisms</p> Signup and view all the answers

    What is one explanation for the similarities in embryological development among organisms?

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

    What is a characteristic shared by all species of life?

    <p>Similar genetic machinery.</p> Signup and view all the answers

    What is the result of the mutation in the peppered moth population?

    <p>Black moths had a selective advantage.</p> Signup and view all the answers

    What led to the decrease in the black moth population?

    <p>Decreased pollution.</p> Signup and view all the answers

    What is the result of using insecticides?

    <p>The survival of only the most resistant individuals.</p> Signup and view all the answers

    Why do insecticide-resistant insects survive?

    <p>They have a specific genetic trait.</p> Signup and view all the answers

    What happens to the proportion of insecticide-resistant individuals in subsequent generations?

    <p>It increases.</p> Signup and view all the answers

    What is the main factor that drives the evolution of insecticide resistance?

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

    What is the primary purpose of comparing fossils from older rock layers with fossils from younger rock layers?

    <p>To show that life on Earth has changed over time</p> Signup and view all the answers

    What do fossils of extinct organisms show?

    <p>That many species have become extinct</p> Signup and view all the answers

    What is the main difference between relative age and absolute age?

    <p>Relative age is the age in relation to other objects, while absolute age is the actual age</p> Signup and view all the answers

    What can be determined by studying the fossil record?

    <p>The history of life on Earth and how it has changed over time</p> Signup and view all the answers

    What is the primary advantage of radioactive dating in determining the age of fossils?

    <p>It provides an absolute age of the fossil</p> Signup and view all the answers

    What is the significance of fossils found in lower strata?

    <p>They are older than fossils found in higher strata</p> Signup and view all the answers

    What is the primary reason why different animals on different continents have evolved with similar features?

    <p>They are exposed to similar pressures of natural selection</p> Signup and view all the answers

    What is the significance of homologous structures in understanding evolution?

    <p>They demonstrate that different species have similar ancestors</p> Signup and view all the answers

    What is the main implication of vestigial organs in living organisms?

    <p>They are remnants of structures that had important functions in ancestors</p> Signup and view all the answers

    What is the primary reason why embryos of different species look very similar in their early stages of development?

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

    What can be determined by observing transitional fossils?

    <p>How organisms have changed over time</p> Signup and view all the answers

    What is the main reason why species that look very different from each other can be more closely related than species that look similar to each other?

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

    What is the implication of the shared genetic machinery of DNA and RNA among all species of life?

    <p>It indicates that these species have undergone a similar process of evolution.</p> Signup and view all the answers

    What is the role of the environment in the evolution of the peppered moth population?

    <p>It provides a constant selective pressure favoring the black moth trait.</p> Signup and view all the answers

    What is the result of the adaptation of insect populations to insecticides?

    <p>The evolution of insecticide resistance in the target population.</p> Signup and view all the answers

    What is the significance of the common ancestry of organisms in understanding evolution?

    <p>It explains the similarities in embryological development among organisms.</p> Signup and view all the answers

    What is the effect of industrialization on the lichen-covered trees and rocks in Britain?

    <p>It causes the death of lichens on the trees and rocks.</p> Signup and view all the answers

    What is the advantage of the black moth trait in the presence of pollution?

    <p>It provides a camouflage against the black background.</p> Signup and view all the answers

    What is the difference between the black and white moths in terms of their survival and reproduction?

    <p>The black moths have a selective advantage in a polluted environment, while the white moths have a selective advantage in a non-polluted environment.</p> Signup and view all the answers

    What is the role of alleles in the evolution of insecticide resistance?

    <p>They provide a selective advantage against the insecticide.</p> Signup and view all the answers

    What is the main purpose of comparing fossils from older rock layers with fossils from younger rock layers?

    <p>To document that life on Earth has changed over time</p> Signup and view all the answers

    What do scientists seek to determine when studying fossils?

    <p>The relative age and the absolute age of a fossil</p> Signup and view all the answers

    What do the similarities in embryological development among organisms suggest about their evolutionary history?

    <p>That they share a common ancestor</p> Signup and view all the answers

    What can be learned from the fossil record?

    <p>All of the above</p> Signup and view all the answers

    What is the primary advantage of comparative anatomy in understanding evolution?

    <p>It provides evidence for the common ancestry of organisms</p> Signup and view all the answers

    What is the primary reason why transitional fossils are important evidence for evolution?

    <p>They show the gradual changes in organisms over time</p> Signup and view all the answers

    What is the main significance of radioactive dating in determining the age of fossils?

    <p>It determines the absolute age of the fossils</p> Signup and view all the answers

    What can be inferred about the evolutionary history of organisms that have vestigial organs?

    <p>They have ancestors with similar structures that had important functions</p> Signup and view all the answers

    What do fossils provide the most powerful evidence for?

    <p>The evolution of species over time</p> Signup and view all the answers

    What is the main significance of the fossil record in understanding evolution?

    <p>It is a record of the history of life on Earth</p> Signup and view all the answers

    What is the primary reason why biogeography is important in understanding evolution?

    <p>It shows that different species have adapted to different environments</p> Signup and view all the answers

    What is the primary implication of homologous structures in understanding evolution?

    <p>They suggest that organisms share a common ancestor</p> Signup and view all the answers

    What is the primary explanation for the similarities in embryological development among organisms?

    <p>Shared common ancestry</p> Signup and view all the answers

    What is the primary reason for the decrease in the black moth population in the 1950s?

    <p>Strong pollution controls were implemented</p> Signup and view all the answers

    What is the primary driver of the evolution of insecticide resistance in insect populations?

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

    What is the significance of the shared genetic machinery of DNA and RNA among all species of life?

    <p>It indicates a common ancestor</p> Signup and view all the answers

    What is the primary advantage of the black moth trait in the presence of pollution?

    <p>Better survival and reproduction</p> Signup and view all the answers

    What is the primary effect of the adaptation of insect populations to insecticides?

    <p>Increased insecticide resistance</p> Signup and view all the answers

    What is the primary role of the environment in the evolution of the peppered moth population?

    <p>Selecting for the black moth trait</p> Signup and view all the answers

    What is the primary implication of the common ancestry of organisms in understanding evolution?

    <p>It indicates a common ancestor</p> Signup and view all the answers

    Study Notes

    The Evidence for Evolution

    • Evolution is supported by five key areas of evidence: the fossil record, biogeography, homologous body structures, embryology, and biological molecules.

    The Fossil Record

    • Fossils are the remains or traces of organisms that died long ago, providing a record of the history of life on Earth.
    • Fossils show that past organisms differed from present-day organisms, and many species have become extinct.
    • By comparing fossils from older rock layers with fossils from younger rock layers, scientists can document that life on Earth has changed over time.
    • Relative age is the age of an object in relation to the ages of other objects, while absolute age is the actual age of the fossil in years, determined through radioactive dating processes.
    • Transitional fossils have features and characteristics intermediate between ancient ancestors and their later descendants, providing evidence of how organisms have changed over time.

    Biogeography

    • Biogeography is the study of the geographic distribution of organisms around the world.
    • Similar environments on different continents have different species, suggesting that species now living on different continents had different ancestors.
    • Because of similar selection pressures, different animals on each continent evolved with similar features.

    Homologous Body Structures

    • Homologous structures are body parts that are similar in structure but different in function, resulting from common ancestry.
    • Examples include the bone structure of human arms, cat forelegs, horse forelegs, bat wings, and dolphin flippers.
    • These homologous structures show that different organisms shared a common ancestor in their distant past.

    Vestigial Organs

    • Vestigial organs are structures that seem to be “left over” from a previous ancestor and serve no purpose in the living organism.
    • Examples include the skeletons of present-day whales, which reveal remnants of hipbones and leg bones, and the human tailbone, or coccyx.

    Embryology

    • Embryology is the study of embryos and their development.
    • Embryos of different species look very similar in their early stages of development, suggesting that these organisms shared a common ancestor.
    • All vertebrate embryos have structures called pharyngeal gill slits in their throat regions and a postanal tail at some point during their development.

    Biological Molecules

    • All species of life have the same basic genetic machinery of DNA and RNA.
    • All types of green plants have similar types of chlorophylls, showing similarities at the molecular level.

    Evolution in Action

    • Evolution can be observed directly in some organisms due to the effects of human civilization, such as industrialization and pollution.
    • Examples include the peppered moth, which evolved from light-colored to dark-colored moths in response to pollution, and the evolution of insecticide-resistant insects.

    The Evidence for Evolution

    • Evolution is supported by five key areas of evidence: the fossil record, biogeography, homologous body structures, embryology, and biological molecules.

    The Fossil Record

    • Fossils are the remains or traces of organisms that died long ago, providing a record of the history of life on Earth.
    • Fossils show that past organisms differed from present-day organisms, and many species have become extinct.
    • By comparing fossils from older rock layers with fossils from younger rock layers, scientists can document that life on Earth has changed over time.
    • Relative age is the age of an object in relation to the ages of other objects, while absolute age is the actual age of the fossil in years, determined through radioactive dating processes.
    • Transitional fossils have features and characteristics intermediate between ancient ancestors and their later descendants, providing evidence of how organisms have changed over time.

    Biogeography

    • Biogeography is the study of the geographic distribution of organisms around the world.
    • Similar environments on different continents have different species, suggesting that species now living on different continents had different ancestors.
    • Because of similar selection pressures, different animals on each continent evolved with similar features.

    Homologous Body Structures

    • Homologous structures are body parts that are similar in structure but different in function, resulting from common ancestry.
    • Examples include the bone structure of human arms, cat forelegs, horse forelegs, bat wings, and dolphin flippers.
    • These homologous structures show that different organisms shared a common ancestor in their distant past.

    Vestigial Organs

    • Vestigial organs are structures that seem to be “left over” from a previous ancestor and serve no purpose in the living organism.
    • Examples include the skeletons of present-day whales, which reveal remnants of hipbones and leg bones, and the human tailbone, or coccyx.

    Embryology

    • Embryology is the study of embryos and their development.
    • Embryos of different species look very similar in their early stages of development, suggesting that these organisms shared a common ancestor.
    • All vertebrate embryos have structures called pharyngeal gill slits in their throat regions and a postanal tail at some point during their development.

    Biological Molecules

    • All species of life have the same basic genetic machinery of DNA and RNA.
    • All types of green plants have similar types of chlorophylls, showing similarities at the molecular level.

    Evolution in Action

    • Evolution can be observed directly in some organisms due to the effects of human civilization, such as industrialization and pollution.
    • Examples include the peppered moth, which evolved from light-colored to dark-colored moths in response to pollution, and the evolution of insecticide-resistant insects.

    The Evidence for Evolution

    • Evolution is supported by five key areas of evidence: the fossil record, biogeography, homologous body structures, embryology, and biological molecules.

    The Fossil Record

    • Fossils are the remains or traces of organisms that died long ago, providing a record of the history of life on Earth.
    • Fossils show that past organisms differed from present-day organisms, and many species have become extinct.
    • By comparing fossils from older rock layers with fossils from younger rock layers, scientists can document that life on Earth has changed over time.
    • Relative age is the age of an object in relation to the ages of other objects, while absolute age is the actual age of the fossil in years, determined through radioactive dating processes.
    • Transitional fossils have features and characteristics intermediate between ancient ancestors and their later descendants, providing evidence of how organisms have changed over time.

    Biogeography

    • Biogeography is the study of the geographic distribution of organisms around the world.
    • Similar environments on different continents have different species, suggesting that species now living on different continents had different ancestors.
    • Because of similar selection pressures, different animals on each continent evolved with similar features.

    Homologous Body Structures

    • Homologous structures are body parts that are similar in structure but different in function, resulting from common ancestry.
    • Examples include the bone structure of human arms, cat forelegs, horse forelegs, bat wings, and dolphin flippers.
    • These homologous structures show that different organisms shared a common ancestor in their distant past.

    Vestigial Organs

    • Vestigial organs are structures that seem to be “left over” from a previous ancestor and serve no purpose in the living organism.
    • Examples include the skeletons of present-day whales, which reveal remnants of hipbones and leg bones, and the human tailbone, or coccyx.

    Embryology

    • Embryology is the study of embryos and their development.
    • Embryos of different species look very similar in their early stages of development, suggesting that these organisms shared a common ancestor.
    • All vertebrate embryos have structures called pharyngeal gill slits in their throat regions and a postanal tail at some point during their development.

    Biological Molecules

    • All species of life have the same basic genetic machinery of DNA and RNA.
    • All types of green plants have similar types of chlorophylls, showing similarities at the molecular level.

    Evolution in Action

    • Evolution can be observed directly in some organisms due to the effects of human civilization, such as industrialization and pollution.
    • Examples include the peppered moth, which evolved from light-colored to dark-colored moths in response to pollution, and the evolution of insecticide-resistant insects.

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    Description

    Learn about the different areas of evidence that support the theory of evolution, including the fossil record, geographic distribution, homologous body structures, embryology, and biological molecules.

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