In This Eight-Year Experiment, 12 Populations of E

question 63

Multiple Choice

In this eight-year experiment, 12 populations of E. coli, each begun from a single cell, were grown in low-glucose conditions for 20,000 generations. Each culture was introduced to fresh growth medium every 24 hours. Occasionally, samples were removed from the populations, and their fitness in low-glucose conditions was tested against that of members sampled from the ancestral (common ancestor) E. coli population.
-Imagine that after generation 20,000, the experimental cells were grown in high-glucose conditions for 20,000 generations (using the same transfer process described) . Refer to the y-axis on the graph and predict the fitness of the new lines when tested in low- and high-glucose conditions.

• A) low: 1.0; high: 1.0
• B) low: 1.6; high: 1.6
• C) low: 1.0; high: 1.6
• D) low: 1.6; high: 1.0

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Definitions:

Long Run

A period sufficient for all inputs, including physical capital and labor, to be adjusted in the production process.

Industry Supply Curve

A graphical representation that shows the relationship between the price of a good and the total output of the industry over a period of time.

Marginal Cost Curves

Graphs that depict the cost of producing one additional unit of a good or service, typically showing how costs vary with production volume.

Short-run

A time frame in which at least one factor of production is fixed, limiting adjustments to production levels.