This is because they are similar characteristically and even functionally, but evolved from different ancestral roots. analogy: The wings of pterosaurs (1), bats (2), and birds (3) are analogous as wings, but homologous as forelimbs. Example F HOMOLOGOUS or ANALOGOUSĪ house cat and a lion evolved from the same ancestor, but no longer look alike (the house cat is much smaller than the lion).\): Homology vs. Example E HOMOLOGOUS or ANALOGOUSĪ whale and a fish both have fins to swim underwater, however a whale is a mammal and a fish isn’t. Example D HOMOLOGOUS or ANALOGOUSĪ poisonous spider and a poisonous snake both have venom sacs. Example C HOMOLOGOUS or ANALOGOUSĮvolved from different ancestors, but because they were placed in the same environment, they have the same function. Įxamples of analogous structures: an insect’s wing, a bird’s wing, a bat’s wingĭecide if the following examples are homologous or analogous…Įvolved from the same ancestor but now have different functions. Įxamples of homologous structures: a whale’s flipper, a cat’s leg, a bat’s wing, a human’s arm.Īnalogous structuresare structures that have similar functions among unrelated animals, but do not come from the same embryological tissues. Homologous structuresare formed in similar ways during embryonic development and share like arrangements, however they can have different forms and functions. Ĭomparative anatomy provides evidence of evolution because it shows that various organisms share a common ancestor. Homologous & Analogous Structures(page 26) 12.16 and 12.17Īnatomy is the study of the structure, or parts, of an organism.
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