Focus Lesson Please grab a new

focus lesson from the front desk.

Use your textbook to find the definitions. You have 5 minutes.Remember our procedures! Grab your group’s pencil box. Have your id out.

Home Learning

• Last class you were assigned Quiz 2 and 3• In order to get full credit you needed to SRE

each question.• DO NOT SAY that you CAN’T• You are smart, you are capable, and it was open

note.

• I will check your quizzes when I check your notebook- that means if you have not yet completed it- YOU STILL HAVE AN OPPORTUNITY TO DO SO!

Daily Objectives

• SWBAT explain how genetic variation, overproduction of offspring, and struggle for survival affect natural selection.• SWBAT explain the concept of

adaptation and its relationship to environmental factors.

Last Class

• Page 22: Modeling Natural Selection• Absent? You owe me pre-

lab questions. Use my data to answer the analysis and conclusion questions.

• Home Learning:• Quiz 2 and 3

This Class

• Finish Page 22• Page 23: Notes Darwin &

Natural Selection• Page 24: Diagramming

the Principles of Natural Selection• Page 25: H.W. Natural

Selection

Page 22: Finishing our Lab•We need to complete our lab. We must

complete data collection before we can finish our analysis and conclusion questions.• Follow along to complete our data table. • You will work independently to analyze

this data, and answer the questions on the following slide.

Analysis and Conclusion

1. How many brown mice were produced in the first generation?

2. How did the proportion of brown mice produced in the third and fourth generations compare to your first generation?

3. Which allele, W or w, was removed from the gene pool by predation? EXPLAIN.

4. If the main predator of mice in this white-sand desert were an animal that hunted by smell rather than sight, would you expect the same results? Explain your reason.

Applying Vocabulary

• You just modeled a theory known as natural selection.• Please open your notebook to your Table

of Contents.•We will start Page 23: Notes Darwin and

Natural Selection• Once you’ve updated your T.O.C. open to

page 23, drop your writing utensils, and look up.

Darwin1831, HMS Beagle

Expedition from England to map coast of South America

Charles Darwin observed differences among island species.

• He began to perceive adaptation to the environment and the origin of new species as closely related processes.

Natural Selection Notes• Natural Selection What is natural selection?• When an adaptation/characteristic allows one organism to

survive and reproduce better than others

The 4 main principles of natural selection are:

Variation: Overproduction: Adaptation: Descent with modification:

Variation• Phenotypic and Genotypic differences that result from

recombination or mutation.

PEPPERED MOTHS:NATURAL SELECTION IN ACTION!

PEPPERED MOTHSpre-industrialization

Which moth would be more fit? WHY???

PEPPERED MOTHSpost-industrialization

Which moth would be more fit? WHY???

Overproduction

• More offspring= better chance one of your offspring will survive to reproductive age

• BUT more offspring also equals more competition

• http://youtu.be/gds666EIx7c

Adaptation: Darwin’s Finches• Darwin, was struck by

the variation of traits among similar species.

• Each island, which had its own unique environment, had its own version of the finch (with varying beaks)

• Darwin concluded that species can adapt to their surroundings to better survive over time.

Descent with modification• Heritable traits- traits that can

be passed down through generations

Favorable heritable traits, those which make it more likely for offspring to reproduce, will be passed on and thrive.

This creates variation from the common ancestor.

http://youtu.be/7dx2CUMtZ-0

Page 24: Principles of Natural SelectionYour textbook used the example of jaguars to explain

the principles of Natural Selection. Can you think of how another organism demonstrates these principles?

Use your background knowledge, or grab one of the articles at the front of the room, to diagram your own example of an organism that shows ALL FOUR principles of natural selection from our notes.

http://youtu.be/ICUsN_OP8gY

Artificial Selection• Selection of traits determined by humans• Ex – breeds of dogs, cats, crops, or birds• Not determined by the environment

Independent Practice• Complete the independent practice• The critical thinking question is the Most important question on this sheetShow me what you’re made of!!!