AP Bio Evolution (Unit 7) Mega-Review (25–26): From Natural Selection to Speciation to Phylogeny

👉 Start mastering AP Bio with the complete Video Pathway: https://learn-biology.com/ap-bio-vide... 👉 Download the free AP Bio Review Checklist: https://apbiosuccess.com/checklist Unit 7 (Evolution) is the biggest unit on the AP Biology exam — and it consistently produces some of the trickiest multiple-choice and FRQ questions each year. This updated 2025 version walks you through every major topic: natural selection, Hardy–Weinberg, evidence for evolution, speciation, phylogeny, and the origin of life. You’ll learn how to interpret real AP-style data, decode Hardy-Weinberg problems, and make sense of reproductive isolation, clades, shared derived traits, and molecular clocks. If you want a 4 or 5, this is the evolution unit review you need. 🌿 What You’ll Learn in This Unit 7 Review • Natural, artificial & sexual selection • Directional, stabilizing, disruptive selection • Adaptive melanism case study — rock pocket mouse logic applied to AP Bio • Evolutionary fitness — what “fitness” really means • Population genetics & Hardy–Weinberg — allele frequencies, p/q math, exam traps • Microevolution mechanisms — genetic drift, population bottlenecks, founder effect, gene flow • Sickle cell disease — heterozygote advantage as an AP Bio classic • Evidence for evolution — homologies, vestigial traits, convergent evolution, pseudogenes • Speciation — prezygotic/postzygotic barriers, allopatric vs. sympatric, adaptive radiation • Phylogeny — reading trees, clades, shared derived traits, outgroups, molecular clocks • Origin of life — Miller–Urey, formation of abiotic monomers, the RNA world hypothesis, the traits of LUCA (the last universal common ancestor of all life). ⏱️ Video Chapters 00:00 Introduction: Evolution and Genetics for AP Biology 01:04 Natural, Artificial, & Sexual Selection (Types of Selection) 05:45 Directional, Stabilizing, Disruptive Selection EXPLAINED 06:49 Natural selection case study: adaptive melanism in the rock pocket mouse 07:52 Defining Biological Fitness & Survival 08:37 Natural selection case study: the peppered moth 11:32 Population Genetics: Allele Frequencies, Gene Pools, & Microevolution 13:13 Hardy–Weinberg Equilibrium: Equations and 5 Conditions 16:36 Genetic Drift, Bottlenecks, Founder Effect, & Gene Flow (Microevolution) 19:48 Population genetics case study: sickle cell disease & heterozygote advantage 21:49 Evidence for evolution overview 21:55 Homologous Structures (Anatomical Evidence for Evolution) 23:30 Vestigial traits 24:13 Analogous Structures & Convergent Evolution EXPLAINED 25:51 Molecular Homologies & Pseudogenes (DNA Evidence) 28:36 Traits shared by all living things: proof that life had a single origin 29:15 Traits shared by all eukaryotes: proof that eukarya had a single origin. 30:08 Evidence for Evolution from Embryology 33:23 Biogeography: Evidence for Evolution 35:23 Fossil Evidence: Relative vs. Absolute Dating Methods 39:23 Evidence of ongoing evolution: resistance genes 41:16 Speciation Overview & The Biological Species Concept (BSC) 42:25 Prezygotic & postzygotic isolating mechanisms 45:04 Allopatric vs. Sympatric Speciation: KEY DIFFERENCES 45:24 How does Allopatric speciation Occur 46:33 Sympatric Speciation: What AP Bio Students Need to Know 48:36 Adaptive radiation and Speciation 49:46 Genetic Variation in Populations: Phospholipids, Hemoglobin, Chlorophyll 55:30 Phylogenetic Trees 101: Clades, Nodes, and Shared Derived Traits 01:02:30 What's the best evidence for constructing phylogenetic trees 01:03:13 Molecular Clocks: Using DNA to Date Evolution 01:04:28 Origin of life: Key Questions for AP Bio Students 01:05:33 What were the key steps that occurred during the origin of life 01:07:37 The Miller-Urey Experiment: Monomers and the Origin of Life 01:10:46 RNA World Hypothesis: Why RNA Preceded DNA 01:13:32 The characteristics of LUCA (the last universal common ancestor) 🎓 Want to ACE AP Bio? Study smarter with interactive tutorials, quizzes, flashcards, and AI-powered FRQ feedback at Learn-Biology.com. 👉 https://learn-biology.com/ap-bio-vide... 👉 https://apbiosuccess.com/checklist Many images in the video were created using Biorender. Learn more at https://biorender.com