Unit 7 · 7.4 — Population Genetics [cite: 28, 44]

Everything to learn here

• Concept: At its core, biological evolution corresponds strictly to a measured change in the specific allele frequencies of a defined population over generational time [cite: 13, 45, 46].
• Concept: Random mathematical occurrences, completely independent of natural selection pressures, frequently drive massive shifts in allele frequencies, particularly in highly isolated small populations [cite: 45, 46].
• Vocabulary: Genetic Drift — totally random, chance events that unpredictably alter specific allele frequencies from one generation to the next [cite: 13, 14, 45].
• Vocabulary: Bottleneck Effect — a rapid, severe drop in population size that indiscriminately alters surviving allele frequencies and heavily reduces overall genetic diversity [cite: 13, 14, 45].
• Vocabulary: Founder Effect — a specific form of genetic drift occurring when a small handful of individuals become isolated and establish a new population with a highly restricted starting gene pool [cite: 13, 14, 45].
• Vocabulary: Gene Flow — the active transfer of alleles into or out of a specific population due to the physical migration of fertile individuals [cite: 14, 45].
• Concept: Evolution is characterized by measurable shifts in the frequency of alleles within a population over several generations.
• Concept: Changes in the proportion of alleles in a gene pool serve as primary evidence for evolutionary processes.

Practice problems for this topic are coming — generated and validated by our AI pipeline, aligned to these exact items.