Favors individuals at both extremes of a trait distribution, potentially leading to the formation of two distinct groups.

Favors average phenotypes and preserves established traits in stable environments.

This section discusses how genetic changes (mutations and recombinations) serve as the raw material for natural selection.

Favors phenotypes at one extreme, leading to a shift in traits when environmental conditions change.

The collection of all genes and their alleles within a population. Summary of Paragraph 58