The figure below is from a study of the bacterium Pseudomona

The figure below is from a study of the bacterium Pseudomonas fluorescens, which has two phenotypes called smooth (SM) and wrinkly-spreader (WS). Meyer et al. (2010) measured the fitness of SM individuals in experimental populations consisting of different proportions of SM and SW individuals. The results of the experiment are shown in the figure. What process do these data demonstrate? Homology Directional selection Frequency dependent selection Heterozygote advantage Mutation

Solution

B) Directional Selection

In Directional selection an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype. So the no of beneficial allele will increase with time.

And here same kind of pattern is there in this graph so this is indicating the correct answer is directional selection.