IB SL Biology 5.4 Evolution
Evolution - The __________________ change in the_________________ characteristics of a
population
Cumulative –
Heritable –
Population –
Charles Darwin
Evidence for Evolution – TOK Link
Evidence for Evolution
1. Fossil Record
2. Homologous Structures
Vestigial Structures
3. Selective Breeding
HW:
Evolution Vocabulary List
Pentadactyl limb (five digit)
Great Transformations Video: 3-27 minutes
This video is the second episode of the PBS Evolution series. It deals with some of the biggest
evolutionary steps in the history of life on earth.
Answer the following questions as you watch the video.
1. For how long has the tree of life been branching?
2. When the history of the earth is represented by an hour, how long has man been around?
3. What are the largest living animals?
4. When did mammals first appear?
5. Phil Gingrich found an unusual fossil in Pakistan. What was unusual about it?
6. How old are the whale skeletons in the Sahara Desert?
7. What was different about the Basilosaurus fossils he found there?
8. What did Frank Fish find that was similar between the way whales, otters, and dogs move?
9. Why are all land animals tetrapods (four-legged animals)?
10. When did animals first move onto land?
11. Early theories said fish moved onto land then developed limbs. What is the current idea about
when limbs developed?
Evolutionary Arms Race:
This video is the third episode of the PBS Evolution series. It deals with evolutionary feedback
interactions between predators and prey. Answer the following questions as you watch the video.
1. Why has the rough-skinned newt in Oregon become much more toxic than needed to protect
itself from most predators?
2. How have garter snakes responded to the increasing levels of toxins in the newts?
3. What predator is attacking us?
4. How many people died of influenza in the epidemic after World War I?
5.Where did we get the first antibiotics we use to fight bacteria?
6.Why don’t antibiotics help with Sasha’s tuberculosis?
7.What is being done to fight multiple-drug-resistant (MDR) TB?
8.What does Paul Ewald suggest we can do about the problem of multiple-drug-resistance?
9.How does the method of bacteria transmission relate to how dangerous it is?
10.Why is Stephen O’Brien studying FIV (feline immunodeficiency virus) in wild cats? What did he
conclude?
11.Why do some people exposed to HIV (human immunodeficiency virus) not become infected?
12.What percentage of European people were killed by the Black Plague?
13. What may be one danger of our using antibiotics so much?
IB Biology 5.4 Evolution – Day 2
Populations
Variation
Sources of Variation
1. Crossing Over
2. Random Assortment
3. Random Fertilization
Evolution in response to environmental change
Example: Antibiotic resistance in bacteria
Environmental Change:
Example: Peppered Moth (Biston betularia)
Environmental Change:
Example: Galapagos Finches
Environmental Change:
Natural Selection
Homework:
 Explain evolution of a species by natural selection in response to evolutionary change (8
min)
 Explain two examples of evolution in response to environmental change (9 min)
 Optional: Evolution extra credit assignment
o Read the Survival of the Sneakiest comic on Edline.
o Explain it in one paragraph using ecology vocabulary