EvolutionLesson 1 of 1 in the course Evidence for evolution and common descent

Comparative Anatomy: History, Homology, and Evolutionary Evidence

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Comparative anatomy examines similarities and differences in the anatomy of different species. Its history shows how careful observation of animal and human bodies helped scientists question inherited assumptions and develop evidence for common descent.

The first specifically anatomical investigation separate from a surgical or medical procedure is associated with Alcmaeon of Croton. Later, Leonardo da Vinci made notes for a planned anatomical treatise that would compare the hands of different animals, including bears.

All flashcards

Comparative anatomy
The study of anatomical similarities and differences among species.
Descent with modification
The process by which inherited structures change across generations as populations adapt.
Homologous structures
Similar anatomical features inherited from a common ancestor, even when they have different functions.
Analogous structures
Similar features that evolved independently, often in response to similar environmental pressures.
Phylogeny
The evolutionary relationships among organisms.

Quiz questions

  1. Why are the forelimbs of cats, whales, bats, and humans considered homologous?Answer: They share a basic skeletal arrangement inherited from a common ancestor.
  2. What best describes analogous structures?Answer: Similar features that evolved independently in different lineages.
  3. What term describes similarity that evolved independently in separate lineages?Answer: Homoplasy
  4. What does comparative genomics add to the study of evolutionary relationships?Answer: It compares genetic material across organisms alongside anatomical evidence.
  5. How can natural selection contribute to differences among homologous structures?Answer: It can favor inherited variations suited to different activities or habitats.

Based on the Wikipedia article Comparative anatomy, licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.

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