Assume you are studying the fossil record of a certain lineage of sharks. You find that sharks in this lineage will maintain the same morphology for long periods of time and only rapidly change their morphology during a speciation event. The evidence you uncover is supportive of which of the following theories? a. Punctuated Equilibrium b. Gradualism c. Start and Stasis d. Increased Net Tempo
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Step 1: The evidence uncovered shows that sharks in a certain lineage maintain the same morphology for long periods of time and only rapidly change their morphology during a speciation event. Show more…
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The punctuated equilibrium hypothesis: a. recognizes that morphological evolution may occur slowly or quickly. b. suggests that major morphological novelties arise gradually. c. may help explain why there are so many “missing links” in the fossil record. d. suggests that the fossil record is usually complete. e. links mass extinctions to the impact of asteroids striking Earth.
According to the punctuated equilibrium model, (a) populations slowly diverge from one another (b) the evolution of species occurs in spurts interspersed with long periods of stasis (c) evolutionary novelties originate from preadaptations (d) reproductive isolating mechanisms restrict gene flow between species (e) the fossil record, being incomplete, does not accurately reflect evolution as it actually occurred
According to the punctuated equilibria model, a. given enough time, most existing species will branch gradually into new species. b. most new species accumulate their unique features relatively rapidly as they come into existence, then change little for the rest of their duration as a species. c. most evolution occurs in sympatric populations. d. speciation is usually due to a single mutation.
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