Molecular Evolution and Amino Acid Substitution Models

Understanding how biological sequences change over time is essential for modern bioinformatics, comparative genomics, and evolutionary biology. This text-based course guides you through the foundational principles of molecular evolution, showing you how mutations arise, fixate, and reverse across ancestral lineages. You will build a solid conceptual foundation in sequence divergence, substitution matrices, and evolutionary modeling, gaining the analytical skills required to interpret genetic changes across time. What you'll learn: - Understand core concepts of molecular evolution, genetic drift, and natural selection at the sequence level - Analyze nucleotide and amino acid substitution matrices to evaluate mutation likelihoods - Model direct and reversing substitutions across evolutionary trajectories - Calculate substitution frequencies and evolutionary rates using standard statistical frameworks - Explore ancestral sequence reconstruction and basic phylogenetic tree interpretation - Apply modern bioinformatics concepts to evaluate sequence alignment reliability The course begins with fundamental terminology and biological definitions before advancing into quantitative substitution models and step-by-step analytical techniques. It is written specifically for beginners in computational biology, life sciences students, and curious analysts with no advanced prerequisites required. Begin reading today to master the essentials of molecular evolution.