Examples of Evolution

Lesson Topic Statement(s) and Objective(s) IB Curriculum Connections Activities
1 Examples of Natural Selection

Direct observations of phenotypes provides evidence of natural selection leading to changes in natural populations over time.

  • Outline how natural selection led to changes in the beaks of Galapagos finches. 

  • Outline how natural selection led to changes in the color of rock pocket mice. 

  • Summarize John Endler’s experiments with guppies in Trinidad which demonstrate phenotypes undergoing evolution.

Changes in beaks of finches on Daphne Major (5.2.A1).

Initial Knowledge Audit (ICI)

Grants Finches notes (OCI)

The search for beak genes in Darwin's finches 

Rock Pocket Mice (OCI)

CoV2 (ICTD)

Darwin’s Fishes (A&B)

Evolution in the Everyday World (A&B)

The warming climate is causing animals to 'shapeshift' (A&B)

Amazonian birds are shrinking (A&B)

How the ‘Black Death’ Left Its Genetic Mark on Future Generations -

Male California sea lions are becoming bigger and better fighters as their population rebounds -- ScienceDaily


2 Unnatural Selection

Human impacts can have unintentional consequences on the evolution of a species.

  • Outline an example of selection due to a human induced selective pressure.  

  • Outline the effect of pollution on development of melanistic insects in polluted areas.

  • Outline the effect of antibiotics on  development of antibiotic resistance in bacteria.

Development of melanistic insects in polluted areas (5.1.A1)


Some strains of bacteria have evolved genes that confer resistance to antibiotics and some strains of bacteria have multiple resistance (6.3.U9).


Evolution of antibiotic resistance in bacteria (5.2.A2).


The theory of evolution by natural selection can explain the development of antibiotic resistance in bacteria (5.2.NOS1).


Industrial melanism (OCI)

Kettlewell and Peppered Moths

Peppered moth simulation

Group Graphics of Examples of Unnatural Selection (ICG; final slide is a template 11X17 for students to illustrate their example)

A New Database Reveals How Much Humans Are Messing With Evolution 

Using data to Investigate Elephant Evolution

Antibiotic Resistance Notes (ICTD)

Selection for Antibiotic resistance simulation (PSOW)

Antibiotic Resistance (A&B)

This Podcast will Kill You Gonorrhea Resistance (49:30-53:45)
3 Artificial Selection

Selective breeding of domesticated animals or plants shows that artificial selection can cause evolution.

  • Define selective breeding and artificial selection.

  • Outline how artificial selection can lead to evolution.

  • Explain an example of artificial selection in a plant. 

  • Explain an example of artificial selection in an animal.

Selective breeding of domesticated animals or plants shows that artificial selection can cause evolution (5.1.U3).

Observing Brassica variation lab (PSOW)

Artificial Selection notes (OCI)

Artificial Selection in the Fast Plant (PSOW)

Artificial Selection in Dogs (ICI)

  • Dog breed cards

  • Save the index cards made by the students until the cladistics unit, when students will sort cards and create a cladogram of the dog breeds.

When Chickens Go Wild (A&B)

New Nice (A&B)

How to Build a Dog (A&B)

ScitC Dual Dog Domestication (A&B)

Ancient Dog DNA Shows Early Spread Around the Globe   (A&B)

Sawbones Selective Breeding (A&B) - listen between 7:45-12:40)
4 Unit Wrap Up and Review    

Unit review slides (ICTD)

Kahoot review (ICTD)

Quizizz Review (OCI)

1 page-summary (OCI)

Final Knowledge Audit (ICI)

5 Assessment