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Introduction to Phylogeny quiz #2

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  • Which type of evidence is least likely to result in changes to a phylogenetic tree?
    Morphological evidence is often less likely to result in changes to a phylogenetic tree compared to molecular evidence, which can provide more detailed insights into evolutionary relationships.
  • Where in a phylogenetic tree would you expect to find the organism that had evolved most recently?
    The organism that evolved most recently would be found at the tips or leaves of a phylogenetic tree.
  • What do phylogenetic trees depict?
    They depict evolutionary relationships based on shared ancestry.
  • Which two main clades branch from the most recent common ancestor of the eumetazoans?
    The two main clades that branch from the most recent common ancestor of the eumetazoans are the Bilateria and the Radiata.
  • What is used to determine phylogeny?
    Phylogeny is determined using evidence from morphological, genetic, and biochemical data to infer evolutionary relationships.
  • Which best describes a branch point in a phylogenetic tree?
    A branch point in a phylogenetic tree represents a common ancestor from which two or more descendant groups diverged.
  • What kind of analysis focuses on the order in which derived characters appeared in organisms?
    Cladistic analysis focuses on the order in which derived characters appeared in organisms.
  • What does the term 'deeply branching' refer to in phylogenetics?
    Organisms that diverged early in the history of life.
  • Which option best describes the concept of an evolutionary tree diagram?
    An evolutionary tree diagram, or phylogenetic tree, is a branching diagram that represents the evolutionary relationships among various biological species based on similarities and differences in their physical or genetic characteristics.
  • Which statements about the phylogenetic tree are true? A) It shows the exact genetic differences between species. B) It represents hypotheses about evolutionary relationships. C) It can be used to predict future evolutionary changes. D) It is static and unchanging.
    B) It represents hypotheses about evolutionary relationships.
  • On a phylogenetic tree, what does the length of a branch typically represent?
    The length of a branch on a phylogenetic tree typically represents the amount of evolutionary change or time that has occurred since the divergence from a common ancestor.
  • How does a phylogenetic tree relate to the passing of time?
    A phylogenetic tree can illustrate the passing of time through the branching patterns, where longer branches may indicate more time has passed since divergence.
  • Which domain is not included in Woese and Fox’s phylogenetic tree?
    D) Protista.
  • On a phylogenetic tree, what does a node represent?
    A node on a phylogenetic tree represents a common ancestor from which descendant species diverged.
  • How do systematists determine if a character is ancestral or derived?
    Systematists determine if a character is ancestral or derived by comparing it to the outgroup, which helps identify shared ancestral traits versus unique derived traits.
  • Which branch point represents the most recent common ancestor of all species depicted in this tree?
    The branch point at the base of the phylogenetic tree represents the most recent common ancestor of all species depicted in the tree.
  • How is a derived character different from other shared traits of a clade?
    A derived character is a trait that evolved in the lineage leading up to a clade and is unique to that clade, distinguishing it from other shared ancestral traits.
  • Which of these statements is not true of the phylogenetic tree? A) It shows the evolutionary history of species. B) It can predict future evolutionary changes. C) It is based on hypotheses about relationships. D) It can be revised with new data.
    B) It can predict future evolutionary changes.
  • Which phylogenetic model does not account for horizontal gene transfer?
    The traditional tree model does not account for horizontal gene transfer, which can complicate the depiction of evolutionary relationships.
  • Which phylogenetic tree(s) highlight(s) a monophyletic group?
    A phylogenetic tree that includes all descendants of a common ancestor highlights a monophyletic group.
  • According to this phylogenetic tree, what can be inferred about the evolutionary relationships among the species?
    According to a phylogenetic tree, species that are closer together on the tree share a more recent common ancestor and are more closely related.
  • Which of the statements is true regarding a phylogenetic tree? A) It is a hypothesis about evolutionary relationships. B) It shows the exact genetic differences between species. C) It can predict future evolutionary changes. D) It is static and unchanging.
    A) It is a hypothesis about evolutionary relationships.
  • What is an evolutionary tree?
    An evolutionary tree, or phylogenetic tree, is a diagram that represents the evolutionary relationships among various species based on their shared ancestry.
  • What is true about a phylogeny regarding its ability to change with new data?
    B) It can be revised with new data.
  • What is the Linnaean hierarchy, and what are the main taxonomic ranks used in this system?
    The Linnaean hierarchy is a nested classification system developed by Carolus Linnaeus to organize living organisms. The main taxonomic ranks, from broadest to most specific, are: domain, kingdom, phylum, class, order, family, genus, and species.
  • How does phylogenetics influence modern taxonomy and the classification of organisms?
    Phylogenetics studies evolutionary relationships and ensures that modern taxonomy reflects shared ancestry. Organisms are grouped together based on common ancestors, so taxonomic classifications represent evolutionary history.