Unit 7: Evolution (5.1, 5.2, 5.4, 10.3) - Orchid

10 Instruction & 0.5 Lab Hours, 7 classes

Dates

Topic Numbers

Class

Activities

Objectives

Homework

4/15 & 4/16

5.1

1

IB Galapagos Origami Bird Activity

  • Mutation, meiosis and sexual reproduction cause variation between individuals in a species.
  • Adaptations are characteristics that make an individual suited to its environment and way of life.
  • Species tend to produce more offspring than the environment can support.
  • Individuals that are better adapted tend to survive and produce more offspring while the less well adapted tend to die or produce fewer offspring.
  • Individuals that reproduce pass on characteristics to their offspring.
  • Natural selection increases the frequency of characteristics that make individuals better adapted and decreases the frequency of other characteristics leading to changes within the species.

4/19 & 4/22

5.1

2

Plant Assessment Results

Nature of Science

Beak of the Finch

  • Application: Changes in beaks of finches on Daphne Major.
  • Application: Evolution of antibiotic resistance in bacteria.

5.2 Natural Selection Notes

Reading: 453-466, 480-485

4/23 & 4/24

5.1

3

Quiz: 5.2

Natural Selection In Action: Pocket Mice

  • Individuals that are better adapted tend to survive and produce more offspring while the less well adapted tend to die or produce fewer offspring.
  • Natural selection increases the frequency of characteristics that make individuals better adapted and decreases the frequency of other characteristics leading to changes within the species.

10.3 video notes

4/25 & 4/26

4

Quiz: 10.3

Gene Pools & Speciation

Speciation Introduction Activity 

Fruit Fly Speciation

  • A gene pool consists of all the genes and their different alleles, present in an interbreeding population.
  • Evolution requires that allele frequencies change with time in populations.
  • Reproductive isolation of populations can be temporal, behavioral or geographic.
  • Speciation due to divergence of isolated populations can be gradual.
  • Speciation can occur abruptly
  • Application: Identifying examples of directional, stabilizing, and disruptive selection
  • Application: Speciation in the genus Allium by polyploidy
  • Skill: Comparison of allele frequencies of geographically isolated populations

5.1 video notes

Reading Pages: 473-476, 488-492

4/29 & 4/30

5

Quiz: 5.1

Stated Clearly: Evidence for Evolution

Data Analysis 5

The Biology of Skin Color

  • Evolution occurs when heritable characteristics of a species change.
  • Traits can be analogous or homologous.
  • The fossil record provides evidence for evolution.
  • Selective breeding of domesticated animals shows that artificial selection can cause evolution.
  • Evolution of homologous structures by adaptive radiation explains similarities in structure when there are differences in function.  
  • Application: Development of melanistic insects in polluted areas.
  • Application: Comparison of the pentadactyl limb of mammals, birds, amphibians and reptiles with different methods of locomotion.

Data Analysis 5

5/1 & 5/2

6

Cladistics

  • How to make cladograms
  • Making a cladograms

Gradualism vs Punctuated Equilibrium Exploration

Data Analysis 5

  • A clade is a group of organisms that have evolved from a common ancestor.
  • Evidence for which species are part of a clade can be obtained from the base sequences of a gene or the corresponding amino acid sequence of a protein.
  • Sequence differences accumulate gradually so there is a positive correlation between the number of differences between two species and the time since they diverged from a common ancestor.
  • Cladograms are tree diagrams that show the most probable sequence of divergence in clades.
  • Evidence from cladistics has shown that classifications of some groups based on structure did not correspond with the evolutionary origins of a group or species.
  • Populations of a species can gradually diverge into separate species by evolution.
  • Continuous variation across the geographical range of related populations matches the concept of gradually divergence.

5.4 Cladograms Notes

Reading Pages: 493-503

5/3 & 5/6

7

Quiz: 5.4

Are humans still evolving?

Evaluation Practice 3: Gene Pools & Speciation

Stated Clearly: How does genetic information evolve

Study for Assessment

5/7 & 5/10

8

Review

Assessment

Data Analysis Practice 5


Additional Material:

Are humans still evolving?

What made humans human? Reading: National Geographic: The evolution of diet

Evolution of Diet Reading Activity

Natural Selection of Brine Shrimp Work Time

The evolution of hominids:

Human Brain & Diet Examination

TOK: Monsanto Selective Breeding

NPR Humans evolving