Comparative anatomy (homologous, analogous, vestigial) Knowledge-Based Download PDF

Questions

1. 1.

   Which developmental or anatomical criterion definitively identifies two structures in different species as homologous rather than analogous?

   • A) Demonstrating that both structures carry out an identical physiological function.
   • B) Showing that both structures evolved under identical environmental selection pressures.
   • C) Tracing their development to equivalent embryonic tissues and ancestral anatomical arrangements.
   • D) Confirming that both structures have become non-functional remnants in the respective species.
2. 2.

   Which of the following statements correctly compares the evolutionary origins and selective pressures associated with homologous and analogous structures?

   • A) Homologous structures arise from divergent evolution from a shared ancestor, whereas analogous structures arise from convergent evolution due to similar selective pressures in distinct lineages.
   • B) Homologous structures arise from convergent evolution in response to identical environments, whereas analogous structures arise from divergent evolution from a shared ancestor.
   • C) Homologous structures perform identical biological functions due to recent common ancestry, whereas analogous structures perform entirely different functions despite sharing anatomical arrangements.
   • D) Homologous structures are nonfunctional remnants preserved from ancestors, whereas analogous structures are fully functional traits shared exclusively within the same order.
3. 3.

   Which of the following best describes homologous structures found in different species?

   • A) Anatomical features that perform the same function but arose independently through convergent evolution
   • B) Reduced structures that have lost their ancestral physiological function due to altered selective pressures
   • C) Anatomical features that share a common ancestral origin and developmental pattern, regardless of their current functions
   • D) Structures that appear identical in external morphology but develop from completely different embryonic germ layers
4. 4.

   Which of the following best explains why the reduced pelvic bones found in modern baleen whales are classified as vestigial structures?

   • A) They evolved independently through convergent evolution to assist in deep-sea diving.
   • B) They represent newly acquired skeletal adaptations that are currently developing to support high-speed swimming.
   • C) They are reduced anatomical remnants that functioned in four-legged terrestrial ancestors but have lost their primary locomotor role.
   • D) They are analogous structures that arose without common ancestry to maintain body symmetry in aquatic environments.
5. 5.

   Which of the following pairs of anatomical features is an example of analogous structures?

   • A) The arm of a human and the flipper of a whale
   • B) The wing of an insect and the wing of a bat
   • C) The forelimb of a cat and the wing of a bird
   • D) The leg of a horse and the arm of a chimpanzee