Explain why the experimental procedures performed by Lenski (and his lab) caused the fitness of the bacteria to increase over time (especially early on) in all 12 of his populations.

Human Anatomy & Physiology (11th Edition)
11th Edition
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Chapter1: The Human Body: An Orientation
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Explain why the experimental procedures performed by Lenski (and his lab) caused the fitness of the bacteria to increase over time (especially early on) in all 12 of his populations. 

RELATIVE FITNESS
1.4
1.3
1.2
1.1
1.0
0.9
500
TIME (generations)
1000
1500
2000
FIG. 5. Finer scale analysis of the trajectory for mean fitness in
one population of E. coli during its first 2000 generations of exper-
imental evolution. Each point is the mean of 10 assays. Solid lines
indicate the fit of a step model.
Transcribed Image Text:RELATIVE FITNESS 1.4 1.3 1.2 1.1 1.0 0.9 500 TIME (generations) 1000 1500 2000 FIG. 5. Finer scale analysis of the trajectory for mean fitness in one population of E. coli during its first 2000 generations of exper- imental evolution. Each point is the mean of 10 assays. Solid lines indicate the fit of a step model.
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