Ok so we have talked about various kinds of selection. In your book there are some beginning equations that show some ways to mathematically model selection and mutation. I think this is something that you either do in great detail or you skip.
Partial detail is just confusing.
We will skip. Applications in Agronomy Landrace Cultivated form that evolved from a natural population of a plant species. For cross pollinators, they consisted of a multitude of heterozygous and heterogeous lines. The correct starting point for fixing discovered types is the individual plant. Next you cross pollinate the superior derived lines to develop new segregating breeding populations from which the next set of improved pure lines can be selected.