Biology 1407 Final Exam Review Questions with 100% Verified Correct Answers

Biology 1407 Final Exam Review Questions with 100% Verified Correct Answers In evolutionary terms, an organism's fitness is measured by its _____. - Correct Answer Contribution to the gene pool of the next generation What is the only evolutionary mechanism that consistently leads to adaptive evolution? - Correct Answer Natural selection Within six months of effectively using methicillin to treat S. aureus infections in a community, all new infections were caused by MRSA. How can this result best be explained? - Correct Answer Some drug-resistant bacteria were present at the start of treatment, and natural selection increased their frequency. Soapberry bugs use needlelike "beaks" to feed on seeds within the fruits of various plants. Bugs feed most successfully when their beak length matches the size of the fruit on which they are feeding. For 25 years, populations of soapberry bugs in central Florida have been feeding on small goldenrain tree fruits that were introduced to the area, rather than on the larger native balloon vine fruits that serve as food for other soapberry bug populations. Beak lengths of soapberry bugs are variable, but the average beak length is shorter in soapberry bug populations that feed on goldenrain tree fruits than in populations that feed on balloon vine fruits, as shown in the graph. How does natural selection act on beak length in soapberry bug populations? - Correct Answer The action of natural selection on beak length in soapberry bug populations varies with the environment. Charles Darwin _____. - Correct Answer Proposed natural selection as the mechanism of evolution The largest unit within which gene flow can readily occur is a - Correct Answer Species Males of different species of the fruit fly Drosophila that live in the same parts of the Hawaiian Islands have different elaborate courtship rituals. These rituals involve fighting other males and making stylized movements that attract females. What type of reproductive isolation does this represent? - Correct Answer Behavioral isolation