A quote from the book "Speciation" by J.A. Coyne and H.A. Orr (2004): "Many ecologists believe that species can coexist only if they show some degree of ecological divergence. Nevertheless, we do not define species as 'reproductively isolated entities having sufficient ecological divergence to permit coexistence.' This is because not all agree that extreme ecological similarity prevents the coexistence of species." The following questions ask about your opinion of this passage. For an evolutionary process (say, natural selection) to explain speciation, it MUST BE capable of generating ecological differences between the newly formed species. Group of answer choices: True False Please explain.
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The passage from the book "Speciation" by J.A. Coyne and H.A. Orr (2004) states that while many ecologists believe that species can coexist only if they show some degree of ecological divergence, not all agree that extreme ecological similarity prevents the Show more…
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Which of the following is false regarding speciation? A. Speciation usually occurs over many generations, with populations gradually diverging due to drift and/or selection until the are fully separate lineages B. Speciation (defined as reproductive isolation) can occur almost instantly – due to changes in chromosome #, for example C. If two recently diverged species come back into contact and hybrid offspring are inviable, there will be selection for differentiation in breeding signals D. If two groups are “good” species according to the biological species concept, they will also exhibit fairly clear differences in appearance or ecology
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Speciation requires different selective pressures to be applied to groups. True False Allopatric speciation is due to the formation of a prezygotic barrier. True False Allopatric speciation through founder events is related to what mechanism of evolution, besides natural selection? Mutation Non-random mating Migration Genetic drift Sympatric speciation usually results due to the separation of populations ecology environments land masses
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The size of the geographical barrier needed to reproductively isolate two populations is dependent on the type of organism. True/false Why do different mutations accumulate in two species once they diverge? Multiple Choice Natural selection favors mutations in one species over another. convergent evolution Once they diverge and become reproductively isolated, mutations form and accumulate separately in the two species. The mutations make the species different. The molecular clock runs at different speeds in different species.
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