Comparative anatomy (homologous, analogous, vestigial) Knowledge-Based Practice

Questions

1. 1.

   In comparative anatomy, which of the following characteristics is shared by both homologous and vestigial structures, but is absent in analogous structures?

   • A) Execution of an active and critical physiological function in modern adult organisms
   • B) Independent emergence in response to similar environmental selective pressures
   • C) Derivation of their underlying anatomical design from a shared common ancestor
   • D) Complete morphological identity between distantly related taxonomic groups
2. 2.

   Which statement correctly explains why analogous structures cannot be used as evidence to establish close evolutionary relationships between two distinct lineages?

   • A) They evolve independently through convergent evolution in response to similar environmental pressures rather than being inherited from a common ancestor.
   • B) They originate from identical embryonic tissue layers that undergo divergent evolutionary changes over time.
   • C) They represent remnant anatomical features that have lost their primary functions due to relaxed selective pressures.
   • D) They share a conserved underlying genetic and skeletal architecture despite performing distinct biological tasks.
3. 3.

   The skeletal organization of the forelimbs in humans, bats, and whales shares a conserved pentadactyl arrangement despite serving distinct locomotive functions. Which evolutionary pattern and anatomical category do these forelimbs represent?

   • A) Convergent evolution driven by similar environmental pressures, resulting in analogous structures
   • B) Divergent evolution from a common ancestor, resulting in homologous structures
   • C) Directional selection reducing nonfunctional remnants, resulting in vestigial structures
   • D) Stabilizing selection acting on unrelated lineages, resulting in identical anatomical designs
4. 4.

   The reduced pelvic bones found in modern baleen whales and the tiny internal hind-limb bones of certain snakes are classified as which type of anatomical evidence for evolution?

   • A) Analogous structures that independently evolved to serve a common locomotory purpose
   • B) Vestigial structures that represent reduced remnants of functional limbs found in their ancestors
   • C) Embryonic anomalies that arise solely from environmental stresses during early development
   • D) Exaptations that recently developed to provide structural anchoring for aquatic locomotion
5. 5.

   Which of the following pairs of anatomical structures represents an example of analogous structures?

   • A) The arm of a human and the flipper of a whale
   • B) The wing of a dragonfly and the wing of a bat
   • C) The foreleg of a horse and the wing of a bird
   • D) The pentadactyl limb of a lizard and the flipper of a seal

Answers and step-by-step solutions appear after you finish the test.