Selection, Speciation & Experimental Evolution

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Abstractions about evolutionary change under selection and variation, covering fitness regimes (frequency-dependent selection, underdominance, genetic load, truncation selection), linkage and drift effects (genetic hitchhiking, Muller's ratchet), speciation and divergence (Bateson-Dobzhansky-Muller model, character displacement), and evolutionary algorithms (differential evolution, Holland's schema theorem).

22 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Antimicrobial Resistance Selection — Read the erosion of an antimicrobial's effectiveness as directional selection — the agent's use prunes susceptible organisms and spares pre-existing resistant variants — so a failing protocol reports a shifted population, not a degraded drug, and the user of the agent is the source of the pressure.
• Bacteriophage Experimental Evolution — The use of rapidly reproducing bacteriophage populations in controlled, replicated, and historically recoverable experiments to test how mutation, selection, drift, epistasis, and host interaction produce evolutionary change.
• Bateson–Dobzhansky–Muller model — A speciation model in which alleles that evolve separately in diverging populations have low fitness when first combined in hybrids because of negative epistasis.
• Character Displacement — Interaction-associated evolutionary divergence of resource-use or mating traits in lineages that meet, with causal evidence needed beyond a geographic contrast.
• Co-adaptation — Co-adaptation is a recurring identity in natural science, engineering, and health defined by this frozen evidence: Process by which two or more species, genes or phenotypic traits undergo adaptation as a pair or group.
• Complete mixing — An evolutionary-game modeling assumption that every population member encounters every other member with equal probability, removing spatial or network assortativity from expected payoffs and replicator dynamics.
• Cultural Attractor Theory — Explain recurrent cultural forms through biased, often reconstructive transmission and its effects on the distribution of variants, without requiring exact copying or inevitable convergence.
• Differential Evolution — A population-based numerical optimizer that creates trial vectors from scaled differences among current candidates and retains them by evaluated quality.
• Frequency-Dependent Selection — Biological selection in which a type's relative fitness depends on how common it or other types are in the population.
• Genetic Hitchhiking — A linked genetic variant changes frequency as positive selection raises the haplotype carrying a nearby favored variant, rather than through that linked variant's own selective advantage.
• Genetic Load — The proportional shortfall of a population's mean genotype-associated fitness below a declared optimal-genotype reference in a specified setting.
• Holland's Schema Theorem — Lower-bound the one-generation expected count of a binary-string schema from relative fitness and variation-survival factors.
• Lottery Competition — Lottery competition allocates scarce vacant sites among competing recruits through a chance-dependent replacement rule.
• Muller's ratchet — Explain the irreversible fitness decline of a finite asexual population as the stepwise, drift-driven loss of its least-mutated genotype class, which without recombination can never be reconstituted.
• Nearly neutral theory of molecular evolution — The nearly neutral theory of molecular evolution is a modification of the neutral theory of molecular evolution that accounts for the fact that not all mutations are either so deleterious such that they can be ignored, or else neutral.
• Partial dominance hypothesis — A population-genetic hypothesis explaining inbreeding depression as increased homozygous expression of deleterious alleles whose harmful effects are recessive or partially recessive in heterozygotes.
• Prenatal Development — The staged biological development of a viviparous organism from fertilization through embryonic patterning and fetal growth until birth, with timing and terminology tied to species and gestational convention.
• Selection in Evolutionary Algorithms — Selection is a genetic operator in an evolutionary algorithm (EA).
• Trivers–Willard Hypothesis — A conditional evolutionary prediction that mothers in better condition favor the offspring sex whose adult reproductive success gains more from that advantage, when maternal effects persist.
• Truncation selection — Truncation selection selects every breeding candidate whose measured or predicted trait value lies beyond a fixed cutoff, giving equal reproductive eligibility within the selected tail and none outside it.
• Underdominance — A population-genetic fitness ordering in which a heterozygote is less fit than either corresponding homozygote in a declared context.
• Vicar of Bray (scientific hypothesis) — An evolutionary hypothesis proposing that sex and recombination accelerate adaptation by assembling favorable alleles from different lineages, allowing a population to track changing environments faster than competing asexual lineages.