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📘 How does convergent evolution repeat a solution?

A shark, a dolphin, and an ichthyosaur each evolved a streamlined swimming body, while birds and bats independently evolved wings that generate lift. To test whether a resemblance is convergence, biologists compare ancestry with anatomy, de

4
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~20 min
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Adults
level
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What you’ll learn

  1. A repeated solution is not a shared inheritanceDefine convergent evolution and distinguish function from ancestry.Similar solutions can evolve independently when lineages face similar physical or ecological demands.
  2. Camera eyes evolved more than onceUse vertebrate and cephalopod eyes to explain independent origins of a complex function.Different developmental routes can produce camera eyes with similar optical jobs but distinct wiring.
  3. Wings solve the problem of liftCompare independent origins of wings in birds, bats, and insects.Flight repeatedly favours aerodynamic surfaces while inherited materials and anatomy remain different.
  4. Streamlined bodies move through waterExplain why sharks, dolphins, and ichthyosaurs converged on streamlined swimming forms.Hydrodynamic constraints repeatedly favour low-drag bodies, but propulsion and anatomy still reflect lineage history.

Questions this course answers

What makes a trait a candidate for convergent evolution?

Convergence is independent evolution of similar function or form under comparable pressures.

Put the evidence chain for convergence in order.

Resemblance alone is not enough; ancestry and selective context complete the argument.

Why are vertebrate and octopus camera eyes a convergence example?

Both solve the optical problem, but their developmental histories and wiring differ.

Match each term to its role.

Eye function and evolutionary history are connected but distinct kinds of evidence.

Why are bird wings and bat wings analogous as wings but homologous as forelimbs?

Homology answers a history question; analogy here answers a shared function question.

Which is a convergent flight solution from a different starting material?

Insect wings and bird wings are separate structures that perform a similar flight function.

Grounded in trusted sources

  • Natural History Museum, Convergent evolution explained with 13 examples, https://www.nhm.ac.uk/discover/convergent-evolution.html
  • Nature Reviews Genetics, The genetic foundations of convergent traits, https://www.nature.com/articles/s41576-026-00933-7
  • Science, Early giant reveals faster evolution of large body size in ichthyosaurs than in cetaceans, https://doi.org/10.1126/science.abf5787
  • Oxford Palaeobiology, Effects of body plan evolution on the hydrodynamic drag and energy requirements of swimming in ichthyosaurs, https://palaeobiology.web.ox.ac.uk/publication/971011/hyrax
  • Wikimedia Commons MediaWiki API, image metadata and thumbnails, https://commons.wikimedia.org/w/api.php

Every Wunder lesson is built from real, reputable sources — never invented.

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