BIOL 102 Study Guide - Midterm Guide: Monera, Myod, Protist
Document Summary
Theory of natural selection on beagle voyage 1831. Species are not immutable, change over time. Descent with modification: common ancestor then diverged over time. Changes in species can be explained by ns (cid:1) Theory evidence on forces altering allele frequency: selection, mutation, genetic drift. Results: bigger and better food, understanding human disease, understanding diversity of life. Evolution- change in genetic composition (allele freq) of pop across generations. Adaptation- processes by which useful characteristics evolve by natural selection. Characteristics that make it more likely to survive (cid:1) Differential survival or reproductive success depending on trait. Differential survival or reproduction based on trait values. Dark moths survived more in polluted areas w/ dark bark trees: bird predation- visual predators. Heritable: genotype & environment contribute to phenotype, heritable if due to genes. Natural selection acts on phenotypes, not genotypes (cid:1) Directional: linear relationship between fitness and phenotypic trait. Next gen, frequency of distribution will shift left.
