ooo T-Mobile LTE 10:04 PM University of Houston C UNIVERSITYof HOUSTON Courses Q
ID: 53022 • Letter: O
Question
ooo T-Mobile LTE 10:04 PM University of Houston C UNIVERSITYof HOUSTON Courses QUESTION Which of the following hypotheses about inheritance would imply that natural selection would not have enough variation to operate effectively? The Lenski evolution experiment cannot provide an unbiased estimate of the fitness eflects of mutations. Why? O Because natural selection does not operate effectively enough Because natural selection operates too effectively. O Because the fitness of the ancestral population cannot be evaluated O Because the mutation rate of E coli is too high O Because the mutation rate ofE coiis too low. QUESTION The following graph summarizes the results of an evolution experiment using E. The filled circles and continuous line show the growth rate of the ancestral population at several temperatures. The open circles and dashed line show the average growth rate of 12 evolved populations assayed at the same temperatures. The 12 populations evolved for 20,000 generations at 37°C in the presence of glucose. Which of the following statements best summarizes the results from this experiment? O The 12 populations evolved to grow faster at all temperatures assayed O The 12 populations evolved to grow more slowly at all temperatures assayed The 12 populations evolved to grow faster at 37 C, but more slowly at the extremeExplanation / Answer
1. Blending inheritance. If blending inheritance were true, variation might have disappeared with every generation and eventually converge upon a single trait, and become indistinuishable
2. Because the fitness of the ancestral population cannot be evaluated
3. The 12 populations evolved to grow faster at 37 C, but more sloly athe extreme temperature sof 20o C, 41o C and 42o C
4. The process similar to natural selection in may ways can cause morphological traits to evolve over severalt housand years
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