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Question: question 9 biologists visit the galapagos islands and collect genetic...

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QUESTION 9 Biologists visit the Galapagos Islands and collect genetic information from various finches. While the finches appear to look identical, there is significant variation in the DNA sequences that code for beak size. They conclude the finches must be different species. Which species concept are the biologists using? Phylogenetic species concept Morphological species concept Biological species concept All of the species concepts None of the species concepts described here QUESTION 10 Biologists visit the Galapagos Islands and record observations regarding the phenotype of every single finch that they encounter. They use calipers to measure the beak sizes of the finches, and notice that there is a bimodal distribution of beak sizes. They conclude that these two distinct groups of finches with different beak sizes must be different species. Which species concept are the biologists using? Biological species concept Phylogenetic species concept Morphological species concept All of the species concepts None of the species concepts described hereAs a result of their 4-year study, what did the Grants learn about natural selection? Natural selection is observable and repeatable in a n atural enviro nment Natural selection can oscillate in direction Natural selection can occur when the environment changes Natural selection results in adaptive change All of the above QUESTION 8 For Questions 8-10, use the following definitions as background information to choose the best answers. Speciation: the evolutionary process through which a single species diverges to form new species Species concept: A paradigm (or way of thinking) that a biologist might use to determine whether or not two individual organisms belong to the same species or not Biological species concept: If individuals cannot mate or cannot produce viable offspring, then they should be considered to be different species Morphological species concept: If individuals have different phenotypes, then they should be considered to be different species Phylogenetic species concept: In brief, if individuals are genetically different enough from each other, then they should be considered to be different species Speciation is often considered to be complete when what occurs? Choose the best answer. Speciation is complete when the species no longer live together Speciation is complete when reproductive barriers are in place and the two species have little or no interbreeding, even when the species coexist again Speciation is complete once a biologists gives the species a new scientific name Speciation is complete when at least one allele is different between individuals Speciation is complete as soon as a single phenotypic trait varies

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