Post-zygotic mechanisms prevent hybrid offspring from reproducing. Hybrid sterility, such as in mules (a horse-donkey hybrid), occurs when hybrids are viable but cannot reproduce due to chromosomal differences.
Consider the following figure of sequence divergence over time. The dashed and solid lines represent synonymous and non-synonymous substitutions, respectively. Which one or more of the following does the figure support?
The figure below shows the reproductive success of two alternative mating strategies, with respect to their frequency in the population. Territorial males (solid line) defend territories to get mates, and Sneaker males (dashed line) obtain mating opportunities without having territories. Which one or more of the following conclusions can be drawn from this figure?