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1. Natural selection is such a powerful force in evolution because cells with even a small proliferation advantage quickly outgrow their competitors. To illustrate this process, consider a cell culture that contains 1.00 million bacterial cells that double every 20. minutes. A single cell in this culture acquires a mutation that allows it to divide faster, with a generation time of only 15 minutes. Assuming that there is an unlimited food supply and no cell death, how long would it take before the progeny of the mutated cell became predominant in the culture? Answer: t = 20. hrs

1. Natural selection is such a powerful force in evolution because cells with even a small proliferation advantage quickly outgrow their competitors. To illustrate this process, consider a cell culture that contains 1.00 million bacterial cells that double every 20. minutes. A single cell in this culture acquires a mutation that allows it to divide faster, with a generation time of only 15 minutes. Assuming that there is an unlimited food supply and no cell death, how long would it take before the progeny of the mutated cell became predominant in the culture? Answer: t = 20. hrs

Biology 2e
Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter19: The Evolution Of Populations
Section: Chapter Questions
Problem 4RQ: What is the difference between micro- and macroevolution? Microevolution describes the evolution of...
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1. Natural selection is such a powerful force in evolution because cells with even a small proliferation advantage quickly outgrow their competitors. To illustrate this process, consider a cell culture that contains 1.00 million bacterial cells that double every 20. minutes. A single cell in this culture acquires a mutation that allows it to divide faster, with a generation time of only 15 minutes. Assuming that there is an unlimited food supply and no cell death, how long would it take before the progeny of the mutated cell became predominant in the culture? Answer: t = 20. hrs 2. Bacterial growth. Under optimal conditions for growth, an E. coli cell will divide around every 20. minutes. For the following parts, assume an E. coli cell to be a cylinder 2.00 um long and 1.00 μm in diameter. If no cells died, how long would it take a single E. coli cell, under optimal conditions in a 500.-L reactor to reach its maximum cell density of 1.00 x 10¹0 cells/mL (a "saturated" culture)? Answer: t = 1043 min = 17.4 hours (17 hrs to 2 sig. figs.)
Transcribed Image Text:1. Natural selection is such a powerful force in evolution because cells with even a small proliferation advantage quickly outgrow their competitors. To illustrate this process, consider a cell culture that contains 1.00 million bacterial cells that double every 20. minutes. A single cell in this culture acquires a mutation that allows it to divide faster, with a generation time of only 15 minutes. Assuming that there is an unlimited food supply and no cell death, how long would it take before the progeny of the mutated cell became predominant in the culture? Answer: t = 20. hrs 2. Bacterial growth. Under optimal conditions for growth, an E. coli cell will divide around every 20. minutes. For the following parts, assume an E. coli cell to be a cylinder 2.00 um long and 1.00 μm in diameter. If no cells died, how long would it take a single E. coli cell, under optimal conditions in a 500.-L reactor to reach its maximum cell density of 1.00 x 10¹0 cells/mL (a "saturated" culture)? Answer: t = 1043 min = 17.4 hours (17 hrs to 2 sig. figs.)
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