HAPPY WEDNESDAY • Turn in Homework (Cosmos Video Worksheet)• Give me back your Project Handout.• Bellwork: Quickwrite – Use the following in a 42 word

quickwrite explaining what you have learned about Evolution so far.

EvolutionAdaptation

FitnessNatural Selection

DarwinSurvival

Reproduction

Front

Back

VocabularyWord

Definition of the word.

A drawing that reminds you of the definition of the word. (Must use at

least one color.)

Evolution NotecardsPeriods 4 and 5

Due Tuesday (1/13/15)

• Adaptation• Charles

Darwin• Evolution• Fitness• Gene Pool

• Natural Selection

• Population• Speciation• Species

Evolution: Bean Lab• The purpose of this lab is to understand evolution by

simulating the competition of different birds for a common food source.

• Each student will simulate different beak shapes (fingers, spoon, knife, and fork).

• In Charles Darwin’s On the Origin of Species, he stated that individuals best suited for a specific habitat will survive and pass their favorite traits on to their offspring.

• In this lab, students that obtain the most food will pass their beak shape to the next generation, while the students with the least amount of food will go extinct.

Problem: Which bird beak is the most successful at catching prey in a certain environment?

Hypothesis: Write a hypothesis predicting which type of beak (fingers, spoon, knife, or fork) will be the most successful in collecting food.

If the beak type is a _____________, then __________________________.

Procedure:• Students will be divided into groups of 4. Each student represents a

different bird species with different shaped beaks. For the first trial, one student will represent each beak shape: fork, spoon, knife, and fingers.

• Spread the beans provided on the paper towels in front of you. The beans represent seeds which are the birds’ food.

• For thirty seconds, each bird removes beans, one at a time, from the paper towel using only their beak (fingers, fork, spoon, or knife). A couple things that must happen:– The box must remain still in the middle of the table– The food must be picked up and placed in your stomach (cup)– The stomach (cup) must remain on the table– You cannot steal from the competition

• After 30 seconds, count the number of beans each species has eaten. Record the data in the data table.

• The bird with the least amount of beans goes extinct. That bird must change its beak shape to the one who ate the most beans.

• Repeat this process two more times.

30 second Timer

Student Name:Trial 1 Trial 1 Trial 2 Trial 2 Trial 3 Trial 3 Final

Beak shape # of beans

Beak shape

# of beans

Beak shape

# of beans

Beak shape

Jessica Fingers 25 Fingers 25 Spoon 35 Fork

Tom Spoon 50 Spoon 51 Spoon 38 Spoon

Derrick Fork 46 Fork 41 Fork 46 Fork

Lisa Knife 4 Spoon 55 Spoon 42 Spoon

Summary of Darwin’s Theory: Individual organisms differ and some of these variations are

heritable (passed on) Organisms produce more offspring than can survive and

many that do survive do not reproduce Because more organisms are produce than can survive, they

must compete for limited resources (food, shelter, etc) Each unique organism has different advantages (good) and

disadvantages (bad) Individuals best suited to their environment survive and

reproduce successfully These organisms that survive pass their heritable traits to

their offspring

Summary of Darwin’s Theory cont’d: Other individuals that are not suited for their

environment die or leave few offspring This process called natural selection causes species

to change over time Species alive today are descended with modification

from ancestral species (their ancestors) This process by which diverse species evolved from

a common ancestor unites all organisms on Earth into a single tree of life

Examples of natural selection

Bunny Simulation

If only one species is considered the "fittest", why do we still have so many variations among species. Why do some birds have very long pointy beaks, while other birds have short flat beaks?