Structure and Function: All living systems are made of structural components; the characteristics of these structures determine how the systems function1. Natural SelectionEffect on fitness: always increases average fitnessEffect on Genetic Variation: varied, depends on circumstance2. Genetic Drift3. Gene Flow4. MutationSexual SelectionMale-male competition  winner gets femaleTraits that help males win fights are favoredStructures are traits that help males win fights (function)Female choice: traits that make males more attractive to females are favoredStructures are traits that help attract a female (function)Females choices based on things like color/patters/songs/callsGenetic Drift: causes allele frequencies change due to chanceTends to act when individuals are reproducingBIOM 140 1nd Edition Lecture 12Outline of Last Lecture I. Phenotypes, Genes, and the EnvironmentOutline of Current Lecture II. Structure and FunctionIII. Sexual SelectionIV. Genetic DrifCurrent Lecture- Structure and Function: All living systems are made of structural components; the characteristics of these structures determine how the systems function1. Natural Selection - Effect on fitness: always increases average fitness- Effect on Genetic Variation: varied, depends on circumstance2. Genetic Drift 3. Gene Flow4. Mutation - Sexual Selection- Male-male competition  winner gets female o Traits that help males win fights are favored- Structures are traits that help males win fights (function)- Female choice: traits that make males more attractive to females are favored- Structures are traits that help attract a female (function) - Females choices based on things like color/patters/songs/calls- Genetic Drift: causes allele frequencies change due to chance- Tends to act when individuals are reproducing These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a