The Following Question Refers to the Figure

question 74

Multiple Choice

The following question refers to the figure.
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.

The cells in the 12 cell lines grown in low-glucose conditions showed the effects of which of the following processes?

• A) gene flow and genetic drift
• B) natural selection and mutation
• C) natural selection and gene flow
• D) conjugation and transformation

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