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Download Notes 9.4 – DISRUPTING HWE EQUILIBRIUM
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Transcript
Science Starter #5 – 2/28/17 What are the five conditions that need to be met for Hardy-Weinberg equilibrium? What does that mean for the population? TAKE OUT YOUR HWE FLIP Notes 9.4 – DISRUPTING HWE EQUILIBRIUM Ch. 16-2 pp. 321-325 Hardy-Weinberg Genetic Equilibrium Evolution: change in population’s genetic material (alleles) over time Genotype frequencies stay the same over time as long as certain conditions are met: Very large (infinite) populations No gene flow emigration (exit) or immigration (in) No mutations Random mating No natural selection Conditions to disrupt HWE 1. Mutation Produces and introduces new alleles in a population Ex. Conditions to disrupt HWE 2. Gene Flow Gene Flow- Movement of individuals in or out of a population Immigration Ex. – In and Emigration – Exit Conditions to disrupt HWE 3. Genetic Drift Genetic Drift - The amount of an allele changes due to random events Affects small populations mostly Lose alleles if not enough to mate or a catastrophe occurs Ex. Conditions to disrupt HWE 4. Non-random mating Sexual Selection - Choose mates based on specific traits and those traits increase in the population Amplifies certain traits and reduces others through sexual selection Conditions to disrupt HWE 5. Natural Selection (3 Types) Organisms best suited to their environment live to reproduce and pass on their genes Acts on a phenotype Three types of selection Directional, stabilizing, disruptive
