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Introduction to Evolution and Natural Selection quiz #3

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  • In a population of birds, what factors can lead to evolutionary change?
    Factors such as natural selection, genetic drift, mutation, and gene flow can lead to evolutionary change in a population of birds.
  • What is an accurate statement about evolution?
    Evolution is a process that results in changes in the genetic makeup of populations over time, driven by mechanisms like natural selection.
  • What is a criticism of the evolutionary theory of aging?
    A criticism is that the theory does not fully explain why aging occurs despite its negative impact on individual fitness.
  • What is a correct statement about inbreeding?
    Inbreeding can lead to an increase in homozygosity and the expression of deleterious recessive traits.
  • What does the process of descent with modification describe?
    Descent with modification refers to the process by which species evolve over time, inheriting traits from common ancestors and undergoing changes.
  • What is evolutionary fitness?
    Evolutionary fitness is the ability of an organism to survive and reproduce, contributing its genes to the next generation.
  • What does macroevolution refer to?
    Macroevolution refers to large-scale evolutionary changes that result in the formation of new species or groups over long periods.
  • What was the evolutionary significance of jaws?
    The evolution of jaws allowed vertebrates to exploit new food sources and led to increased diversification.
  • As hominins diverged from other primates, what key adaptations occurred?
    Key adaptations included bipedalism, increased brain size, and the use of tools.
  • Which is the evolutionary history of a species?
    The evolutionary history of a species is its phylogeny, which traces its lineage and relationships with other species.
  • What is an example of convergent evolution?
    An example of convergent evolution is the development of wings in bats and birds, which evolved independently.
  • Why is the amniotic egg considered an important evolutionary breakthrough?
    The amniotic egg allowed vertebrates to reproduce on land without the need for a water environment, facilitating terrestrial life.
  • What is the evolutionary significance of megaphylls?
    Megaphylls, or large leaves, increased photosynthetic efficiency and contributed to the diversification of land plants.
  • What are examples of macroevolution?
    Speciation, extinction, and adaptive radiation.
  • Do amphibians have an amniotic egg?
    No, amphibians do not have an amniotic egg; they typically lay eggs in water.
  • What were the benefits of arthropods adapting to live on land?
    Benefits included access to new habitats, reduced competition, and the ability to exploit terrestrial food sources.
  • How do vestigial structures support evolution?
    Vestigial structures provide evidence of common ancestry and evolutionary change, as they are remnants of features that were functional in ancestors.
  • Which of the situations below describes vicariance? A) A river divides a population B) A mountain range forms C) A glacier retreats D) All of the above
    D) All of the above
  • How can DNA be used to determine the timing of divergence?
    DNA can be used to determine the timing of divergence by comparing genetic sequences and calculating mutation rates.
  • Why are choanoflagellates considered to be the ancestor of animals?
    Choanoflagellates share structural and genetic similarities with the cells of sponges, suggesting a common ancestry with animals.
  • What is true about genes and evolution?
    Genes are the units of heredity that undergo mutation and recombination, driving evolutionary change.
  • How do analogous structures evolve?
    Analogous structures evolve through convergent evolution, where unrelated species develop similar traits due to similar environmental pressures.
  • What are true characteristics of H. naledi?
    It had a small brain size, exhibited bipedalism, and lived in Africa.
  • Which most clearly shows evolutionary relationships between species?
    Phylogenetic trees most clearly show evolutionary relationships between species.
  • Which organism is considered the most recent common ancestor of living tetrapods?
    Tiktaalik
  • Which structures were key innovations in vertebrate evolution?
    Jaws, limbs, and amniotic egg.
  • What is an evolutionary constraint?
    An evolutionary constraint is a limitation on the course of evolution due to historical, genetic, or developmental factors.
  • Which group of fishes was the first to evolve?
    Jawless fishes were the first group of fishes to evolve.
  • Where did the first vertebrates evolve?
    The first vertebrates evolved in aquatic environments.
  • How has gene duplication played a critical role in evolution?
    Gene duplication provides additional genetic material that can evolve new functions, leading to increased complexity and diversity.
  • What are true statements about deuterostomes?
    Deuterostomes have radial cleavage, include vertebrates, and develop the anus from the blastopore.
  • What are examples of macroevolution?
    The emergence of mammals, the extinction of dinosaurs, and the diversification of flowering plants.
  • Which group is considered to be the closest living relative of animals?
    Choanoflagellates are considered to be the closest living relatives of animals.
  • What is the name of the group that consists only of modern humans and their direct ancestors?
    The group is called the genus Homo.
  • Which statement most accurately describes the evolutionary relationships among the three domains?
    The three domains (Bacteria, Archaea, Eukarya) share a common ancestor, with Archaea and Eukarya being more closely related to each other than to Bacteria.
  • Which statement describes the best evidence that two species share a recent common ancestor?
    The best evidence is the presence of homologous structures, which are similar due to inheritance from a common ancestor.
  • How have animals adapted to survive in the desert?
    Animals have adapted to desert environments through traits like water conservation, nocturnal behavior, and heat tolerance.
  • How does evolutionary classification differ from traditional classification?
    Evolutionary classification groups organisms based on common ancestry and evolutionary relationships, rather than solely on physical similarities.
  • Why are duplications of chromosomal regions suspected to be especially important to evolution?
    Duplications provide extra genetic material that can evolve new functions, increasing genetic diversity and complexity.