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Homologous Vs. Analogous Structures. Homologous Structures (flowers) Broccoli and Cauliflower evolved from Mustard. The bones of the bat, mouse, and human are homologous.

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the bones of the bat mouse and human are homologous
The bones of the bat, mouse, and human are homologous.

The wings of the bat, butterfly, and bird are made of different coverings, and insects do not have internal bones. The wings are analagous. They have the same function and shape, but are made differently.

convergent evolution
Convergent Evolution
  • Organisms that are NOT related evolve similar traits as a result of evolving to fit into similar environments or ecological niches.
in different parts of the world ant eating animals developed long snouts and powerful digging paws
In different parts of the world, ant eating animals developed long snouts and powerful digging paws.

Convergent Evolution

divergent evolution
Divergent Evolution
  • a group from a specific population develops into a new species. In order to adapt to various environmental conditions, the two groups develop into distinct species due to differences in the demands driven by the environmental circumstances.

Darwin’s finches show a path towards divergent evolution. The birds’ beaks are shaped differently so they can occupy different niches in the ecosystem.

embryonic development
Embryonic Development
  • Analyzing the embryos of

animals shows that the

more closely related the

animals are, the more alike

their embryos are during


evolutionary branching tree
Evolutionary Branching Tree
  • Like a family tree, it shows how organisms evolved from common ancestors that may no longer be alive on earth today.
  • Evolutionary branching trees can show how adaptation leads to new species over time.
Predator-prey "arms race"Predators evolve better ways to catch prey,..."Drive, George, drive! This one's got a coat hanger!"