WARM-UP What is genetic drift? Name 2 examples of genetic drift? Explain one example from #2. List 2 examples of adaptation.

Speciation Members of a reproducing population change so much that they can no longer produce offspring with members of a original population. 2 types Allopatric speciation A physical barrier divides one population into more than one population Sympatric speciation A species evolves into a new species without a physical barrier

Allopatric Speciation

Patterns of Evolution Speciation is a long process, and first hand accounts are expected to be rare. However, speciation is visible in patterns of evolution Adaptive radiation (Divergent evolution) Rapid diversification of a species into a number of different species

Patterns of Evolution Convergent Evolution Unrelated species evolve similar traits even though they live in different parts of the world. Occurs in environments that are far apart but that have similar in ecology and climate

hedgehogs porcupines echidnas Europe N. America Australia

Beak differences in Hawaiian honeycreepers

Anteater Central & S. America Australia

MIND MAPS Create a MIND MAP using all of the following terms Be sure to link them all together Word List Evolution -Mimicry Charles Darwin -Bottleneck DNA sequencing -Advantageous Embryo -Phenotype Natural Selection -Founder Effect Comparative Anatomy -Camouflage Fitness -Vestigial Structure Adaptation -Directional Selection Stabilizing Selection -Trait Homologous structure -Disruptive Selection Potential Subject Categories Mechanisms for Evolution Evidence for Evolution Theory of Natural Selection

USE COLOR, IMAGES, STRUCTURE, WORD, LINES IN THE END YOUR MIND MAP SHOULD FLOW ALL CONCEPTS TOGTHER

Lesson Closure 3 things you learned in class today 2 questions you have about the lesson 1 real-life connection

Which of these conditions can act on Chapter 15 Evolution 15.3 Exit Ticket Which of these conditions can act on phenotypes to provide adaptive advantages to a population? mutations natural selection nonrandom mating small population size

Chapter 15 Evolution 15.3 Exit Ticket Why does the ratio of gray to red owls remain the same after the population has doubled? They each have different predators. They compete with one another for resources. Both are equally adapted to survive in their environment. New individuals have emigrated into the population.

Which description is evidence that a speciation has taken place? Chapter 15 Evolution 15.3 Exit Ticket Which description is evidence that a speciation has taken place? A physical barrier has caused two groups from a population to adapt to different environments. Some members can no longer produce fertile offspring with members of the original population. A small group has developed mating behaviors that are different than those of the rest of the population. Some members from a population have developed physical characteristics that are different than the original population.

Which evolutionary pattern is represented by Chapter 15 Evolution 15.3 Exit Ticket Which evolutionary pattern is represented by the similarities between these two organisms that live on separate continents? coevolution convergent evolution directional evolution divergent evolution

Chapter 15 Evolution 15.3 Exit Ticket The rapid evolution of these cichlid fish in new water is an example of what type of speciation? coevolution mutation adaptive radiation convergent evolution

Why are cheetahs so genetically similar that they appear inbred? Chapter 15 Evolution 15.3 Exit Ticket Why are cheetahs so genetically similar that they appear inbred? Individuals in the population had mated randomly. Their population had declined to a very low number. A large sample of the population settled in a separate location. A mutation appeared and became common in subsequent generations.

Within a population of squirrels, those that Chapter 15 Evolution Standardized Test Practice Within a population of squirrels, those that live higher in the mountains where it is cooler have long fur. Squirrels that live in the foothills where it is warmer have short fur. The original population is believed to have had intermediate fur length. Which graph represents this type of natural selection?

Standardized Test Practice Chapter 15 Evolution Standardized Test Practice

The remaining bacteria will die because of the drastic decimation Chapter 15 Evolution 15.3 Exit Ticket What is the most likely effect of killing 80% of a colony of bacteria with a certain antibiotic? The remaining bacteria will re-grow into a new colony more resistant to the antibiotic The remaining bacteria will die because of the drastic decimation The bacteria will not cause any further infections because their numbers were drastically reduced The bacteria will try to start a new colony where the antibiotic will not be found