Lab 2 - Phylogenetic Analysis
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Questions and Answers

What aspect makes phylogenetic trees considered scientific hypotheses?

  • They represent fixed relationships among species.
  • They are determined only by fossil records.
  • They are based solely on morphological traits.
  • They can be modified based on new data. (correct)
  • Which statement correctly defines phylogeny?

  • The study of fossil records.
  • The study of reproductive strategies of organisms.
  • The study of organism nomenclature.
  • The study of speciation and evolutionary history. (correct)
  • What is the term for the basal internode at the bottom of a phylogenetic tree?

  • Clade
  • Root (correct)
  • Branch
  • Node
  • Which statement about convergent evolution is true?

    <p>Bats, birds, and bees have wings through convergent evolution.</p> Signup and view all the answers

    What can be inferred from more genetic differences between two species?

    <p>They are distantly related.</p> Signup and view all the answers

    Which of the following statements applies to taxa A, B, C, D, and E regarding derived traits?

    <p>Taxa E serves as the outgroup with only ancestral traits.</p> Signup and view all the answers

    Which statement regarding the relationships of mantids, beetles, and cockroaches is false?

    <p>Mantids are closest to beetles than to cockroaches.</p> Signup and view all the answers

    Why are organisms B and C more closely related than B and A in the Boltidae group?

    <p>B and C share more derived traits than B and A.</p> Signup and view all the answers

    In Exercise 3, what is the name of the software used to perform your analysis?

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

    Distantly related species have few genetic differences.

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

    Study Notes

    Phylogenetic Trees

    • Phylogenetic trees are scientific hypotheses, modifiable with new data.
    • They represent evolutionary relationships among organisms.

    Phylogeny

    • The study of evolutionary relationships among organisms.
    • Includes names of organisms, convergent evolution, speciation, and evolutionary history (not fossils).

    Tree Terminology

    • Root: The basal internode at the bottom of the tree.
    • Branch: Represents lineages diverging from a common ancestor.
    • Node: Where two lineages diverge from a common ancestor.
    • Clade: A common ancestor and all of its descendants

    Convergence

    • The wings of bats, birds, and bees evolved independently, not from a common ancestor.
    • This is an example of convergent evolution.

    Genetic Differences and Relatedness

    • Greater genetic differences correspond to more distant evolutionary relationships between species.
    • Distantly related species, therefore, display more genetic difference.

    Software for Analysis

    • MEGA was used for analysis in one of the exercises.

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