Presentation on theme: "Agenda Lethal Alleles and Natural Selection Quiz (15) Genetic Drift Do Now + Ppt (15) Genetic Drift Reading (25) Mastery Questions + MC (5) GD vs NS concept."— Presentation transcript:
Agenda Lethal Alleles and Natural Selection Quiz (15) Genetic Drift Do Now + Ppt (15) Genetic Drift Reading (25) Mastery Questions + MC (5) GD vs NS concept map (10) Is Evolution More than just a Hypothesis? (30)
Objective Students will explain how genetic drift is when a population changes due to random chance events, and explain the difference between evolution by genetic drift and evolution by natural selection
What is evolution? Evolution occurs when a group of organisms changes over time –Explains how today’s organisms came from ancient organisms
Evolution Can Occur in Two Different Ways Evolution is caused by: –Natural Selection: When a population changes as individuals that are best adapted for the environment survive and reproduce –Genetic Drift: W hen a population changes due to random events.
Evolution by Genetic Drift Genetic Drift: is a random, non-selective change that changes allele frequency in a population. Let’s break that down… –Genetic: talk about genotypes and alleles –Drift: Randomly changing
Genetic Drift Reading 10 min per page Must have AT LEAST 5 comments/pictures/questions in the margin of each page for a stamp Read for mastery, not speed!
Genetic drift produces populations that a.Are more likely to survive because a high degree of variation is created in the population b.Are less likely to survive because the most fit individuals always die c.Are less likely to survive because little variation exists in the population
Is Evolution more than a hypothesis? Read over Evolution Writing Prompt (2) Evidence for Evolution Gallery Walk (10) 2 Corners: Agree/Disagree (2 min) Share with your bio buddy (2 min) WRITE! Is Evolution more than a hypothesis (educated guess)? (14 min)