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Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

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Page 1: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Evolution

Genetic change in a population over time

What are the 3 necessary ingredients for evolution?

Page 2: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

• Evolution is a natural phenomenon that will occur wherever suitable conditions exist

• It’s a genetic change in a population over time• Is the example below macroevolution or microevolution?

Page 3: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Evidences for Evolution

• Fossils: What is a fossil?

• Comparative Embryology

• Comparative Biochemistry

• Comparative Anatomy

Page 4: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Fossil Evidence

• Preservation in ice and acid

• Preservation in amber

• Preserved hard parts

• Petrification

• Molds and casts

• Imprints

Page 5: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Preservation in Ice & Acid• Organisms are kept from decaying

in ice or strongly acidic conditions.• Why are bogs conducive to preservation

and not decomposition?

Page 7: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Preserved Hard Parts

• Organic materials in hard parts of living things leech out and are replaced by minerals in the surrounding rock

Page 8: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Petrification

• Organic materials in tree tissue leech out and are replaced by minerals in the surrounding rock

Page 12: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Relative Datingestimating the age of something compared to something else

Page 13: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Absolute Dating

RadioMetric Dating Video: http://www.pbs.org/wgbh/evolution/library/03/3/l_033_01.html

Page 14: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

• radioactive: decay of nuclei of unstable atoms half-life

• uranium 238 = 4.5billion yrs uraniumlead

• C14 up to 40,000yrs• C14C12 half life 5700

• If a piece of rock is found with a Lead:Uranium ratio of 7:1, how old is the rock?

Page 15: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Comparative Embryology• "ontogeny

recapitulates phylogeny"

• each embryo has to repeat the adult stages of its biological predecessors

• Haeckel was a fraud!

Page 16: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Comparative Biochemistry

• DNA sequence and protein molecules

• What is the adjacent picture called?

• What is the name of the process which generates it?

Page 17: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Comparative Anatomy

• Homologous structures

• Analogous structures

• Vestigial structures

Page 18: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Homologous Structures• Similar in design, different in function

Page 19: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

• Divergent Evolution offspring of a common (similar) ancestor diverge b/c they are adapted by different environments

Adaptive Radiation process by which ancestral species evolve into a number of diff species

Page 21: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

• Rolling for defense

Page 22: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

What is the name of this animal?

Page 23: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

• Echolocation for feeding in darkness (Oil bird and bat)

Page 24: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

• Convergent Evol.• result of geographic

isolation and niches to be filled

• process by which different species evolve similar structures or adaptations to similar (but diff) environments

Page 25: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Parallel Evolution

Page 26: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Divergent, Convergent & Parallel Evolution

Make a Venn comparing the 3 types of evolution. 3 facts per group.

Page 28: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Co-Evolution• When two different

organisms change in response to each other

• How many bees are on the screen? Write your answer and then watch the videos.

Evolution of Camouflage:

Orchard Wasps

Page 30: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Vestigial structures• a structure or organ

that has no apparent use

• if organisms use the minimal amount of E to survive,why would they use E to form a structure that has no use?

Page 31: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Theories of Evolution• Empedocles• Aristotle• Linnaeus• Lamarck• Cuvier• Lyell• Wallace/Darwin• Stanley/Gould• Science influences

society, which influences science.

Page 32: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Lamarck & Acquired Characteristics

• Acquired characteristics traits acquired during life can be passed to offspring

• Theory of Use & Disuse what we use gets larger and what we don’t gradually disappears

Page 33: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Natural Selection (Darwin & Wallace)

• Overproduction

• Struggle for existence/ Competition

• Variation within a species

• Survival of the fittestproblem: how did variations arise?

How does Evolution Really Work

Page 34: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Overproduction

• Thomas Malthus "Essay on Principles of Population"

• geometric/exponential progression (vs arithmetic)

Page 36: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Speciation

Formation of a new species (group of organisms that can reproduce fertile offspring) needs:

1. Available niche

2. Genetic Isolation

3. Time

Page 37: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Genetic Isolation

Geographic/allopatric Isolation results from physical separation

Ecological/sympatric Isolation:• Mechanical (post/pre zygotic)• Temporal• Ethological (behavioral)• Isolating Lacewing songs

Page 38: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Directional Selection

• Selection against one extreme

• Fit to be ONE extreme

Page 39: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Stabilizing Selection• Selection against

both extremes

• Fit to be AVERAGE

Page 40: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Disruptive Selection

• Selection against the average

• It is fit to be BOTH extremes

Page 41: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

• Give a plausible example of each of the 2 types of speciation.

• Give a plausible example of each of the 3 types of selection.

• Making a Cladistic: Try the following activity: http://www.pbs.org/wgbh/evolution/change/family/

Page 42: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

Why Does Evolution Matter Now?

• Evolution of Antibiotic Resistance

• Biological Invaders

Page 43: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

How Did We Meet the GPS?SB5. Students will evaluate the role of natural selection in the development of the theory of evolution.

a. Trace the history of the theory.

b. Explain the history of life in terms of biodiversity, ancestry, and the rates of evolution.

c. Explain how fossil and biochemical evidence support the theory.

d. Relate natural selection to changes in organisms.

e. Recognize the role of evolution to biological resistance (pesticide and antibiotic resistance).

Page 44: Evolution Genetic change in a population over time What are the 3 necessary ingredients for evolution?

References

• Absolute Dating: dig.anthro.niu.edu/anth102/ 01intro/1dating.html

• PBS Evolution Library: http://www.pbs.org/wgbh/evolution/library/index.html

• Mimicry: http://www.morning-earth.org/Graphic-E/Transf-Mimic.html

• NOVA: Homeobox Genes