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Natural Selection Ch 14,15 Biology: Exploring Life Stratton Click here for 14.3-14.5 Birds on an Island Lab Stabilizing Selection LabClick here for Ch.

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Presentation on theme: "Natural Selection Ch 14,15 Biology: Exploring Life Stratton Click here for 14.3-14.5 Birds on an Island Lab Stabilizing Selection LabClick here for Ch."— Presentation transcript:

1 Natural Selection Ch 14,15 Biology: Exploring Life Stratton Click here for Birds on an Island Lab Stabilizing Selection LabClick here for Ch 15 Click here for

2 Charles Darwin and 14.2 Biology 1 Stratton

3 14.1 Darwins Accomplishments Before Darwin Leading theory of inheritance – Leading theory of inheritance –Lamarck

4 14.1 Darwins Accomplishments Darwins trip Darwins trip Ship: Ship: Job: Job: Hobby: Hobby: Findings: Findings:

5 14.1 Darwins Accomplishments Publishes The Origin of Species 1859: 1,250 copies 1859: 1,250 copies 2 main points 2 main points 1. Ancestry 2. Selection

6 14.1 Darwins Accomplishments Natural selection - Natural selection - From Pearson Education Biology: Exploring Life, 2004

7 14.1 Darwins Accomplishments Concept Check What is natural selection? 2. Which of the following is an adaptation: the sharp teeth of a house cat, or a scar on the cat's ear? Explain.

8 14.2 Evidence for Natural Selection 1. Fossil Record

9 14.2 Evidence for Natural Selection 2. Geographic distribution Placental vs. Marsupial Placental vs. Marsupial Island Bio-Geography Island Bio-Geography eschscholtzii, a ring species

10 14.2 Evidence for Natural Selection 3. Homologous structures From Pearson Education Biology: Exploring Life, 2004

11 14.2 Evidence for Natural Selection 4. Analogous structures

12 14.2 Evidence for Natural Selection 5. Vestigial Structures

13 14.2 Evidence for Natural Selection Concept Check Why are older fossils generally in deeper rock layers than younger fossils? 2. How can evolutionary theory explain why Australia is home to relatively few native placental mammals? 3. What are homologous structures? Return to Main Menu

14 Natural Selection 14.3, 14.4, 14.5 Biology 1 Stratton

15 14.3 Theory of Natural Selection 1. # offspring produced 2. Adapted 3. Not adapted 4. Variations exist in populations A. Human hair color B. Wolf coloring patterns From /text/chapter14/concept14.3.html

16 14.3 Theory of Natural Selection 5. Artificial Selection 6. Selective Breeding Ex. toy poodles Ex. toy poodles Ex. watermelon Ex. watermelon

17 14.3 Theory of Natural Selection Natural Selection Changes over long periods of time Changes over long periods of time Successful individuals have traits fit for environment Successful individuals have traits fit for environment Selective Breeding Changes in a few generations Changes in a few generations Successful individuals have traits humans like Successful individuals have traits humans like

18 14.3 Theory of Natural Selection From

19 14.3 Theory of Natural Selection Concept Check In Darwin's view, what conditions lead to a struggle for existence among individuals in a population? 2. What is the goal of artificial selection? 3. Why does a specific pesticide become less effective over time?

20 14.4 Microevolution 1. Genetic Drift 2. Bottleneck effect A. Ex. Cheetahs - B. Ex. Pandas - C. Ex. Humans – 3. Founder Effect science/biology/animals/reproductive/cheetah/cheetah.html&h=212&w=300&sz=18&tbnid=QH0K1jUCrNjQcM:&tbnh=7 8&tbnw=111&hl=en&start=1&prev=/images%3Fq%3Dcheetah%2Bsperm%26svnum%3D10%26hl%3Den%26lr%3D

21 14.4 Microevolution Concept Check What is a gene pool? 2. How has genetic drift affected the world's populations of cheetahs? 3. Describe what is meant by a "biologically fit" organism.

22 14.5 Natural Selection / Health 1. Sickle Cell A. Advantage? B. Disadvantage? 2. Antibiotic Resistant Bacteria

23 14.5 Natural Selection / Health Concept Check Under what conditions is the sickle cell allele beneficial to a heterozygous individual? 2. Identify a possible risk of overuse of antibiotics. Return to Main Menu

24 Evolution Ch 15 Biology 1 Stratton

25 15.1, 15.2 Species Defined 1. Morphologically Distinct

26 15.1, 15.2 Species Defined 2. Reproductive Isolation A. Timing 1. Eastern spotted 2. Western spotted

27 15.1, 15.2 Species Defined 2. Reproductive Isolation A. Timing B. Behavior 1. Fireflies 2. Birds

28 15.1, 15.2 Species Defined 2. Reproductive Isolation A. Timing B. Behavior C. Gametic 1. Pollen 2. Eggs / Sperm

29 15.1, 15.2 Species Defined 2. Reproductive Isolation A. Timing B. Behavior C. Gametic D. Geographic

30 15.3 Fossil Record 1. Formation of fossils A. Same age rocks = B. Periods of Time

31 15.3 Fossil Record (FILL IN NOTES)

32 15.3 Fossil Record (cont.) 2. Geologic Time Scale A. Relative dating B. Radiometric dating C. Fossil Dating Return to Main Menu

33 15.3 Fossil Record (FILL IN NOTES)


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