happy tuesday bellwork: write down only the bolded red portion and your answer. two species of mice...

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HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse species is WHITE with BLACK spotting. The other is BROWN with WHITE spotting. After a year, the population of white mice has dramatically decreased, while the population of the brown mice has slightly increased. Why would this be happening?

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Page 1: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

HAPPY TUESDAY

Bellwork: Write down only the bolded red portion and your answer.

Two species of mice live in a field in the middle of East Texas. One mouse species is WHITE with BLACK spotting. The other is BROWN with WHITE spotting.

After a year, the population of white mice has dramatically decreased, while the population of the brown mice has slightly increased.

Why would this be happening?

Page 2: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

Standard: (7E)Analyze and evaluate relationship of natural

selection to adaptation.

Essential Question:

Page 4: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

I. Evolution: change over time.

Page 5: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

A. Scientists involved in the Evolution theory1. Hutton and Lyell: helped scientists realized 2

thingsa. Earth is millions of years old b. the processes that changed Earth in the past

are the same as the present.

At that time, most scientists believed that the Earth was only a few thousand years old.

Page 6: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

2. Jean-Baptiste Lamarck: one of the first scientists to recognize that living things have changed over

time.

Page 7: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

a. Lamarck proposed that by selective use or disuse of organs, organisms acquired or lost

certain traits during their lifetime. b. These traits could be passed to the offspring. c. Over time, this process led to a change in a

species.

Page 8: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

d. Lamarck’s theory proved incorrect because he did not know that an organism’s behavior has no effect on its heritable characteristics.

Page 9: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

3. Malthus: contributed to Darwin’s theory of evolution by establishing the idea that population size is limited by

environmental resources.

Page 10: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

4. Charles Darwin: contributed more to our understanding of evolution than anyone else.

a. Darwin traveled, made observations and collected evidence that led him to propose his revolutionary process.

Page 11: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

b. Darwin published the results of his work in a book called On the Origin of Species.

Page 12: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

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

Page 13: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

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

Page 14: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

One of Darwin’s most important insights was that members of each species vary from one another in important

ways.

Today, we know that heritable variation in

organisms is caused by variations in their genes.

Page 15: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

II. How Evolution Works

Page 16: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

A. Artificial selection: selection by humans for breeding of useful traits

Page 17: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

1. The struggle for existence is competition among

members of a species for food, living space, and the other necessities of life.

2. High birth rates and a shortage of life’s basic needs eventually forces organisms into a competition for resources.

Page 18: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

B. Fitness: the ability of an organism to survive and reproduce

1. Fitness is the result of adaptations.

Page 19: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

2. Adaptation: any inherited characteristic that increases an organism’s chance of survival.

Page 20: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

a. Successful adaptations: - enable organisms to become better suited to

their environment - increase an individual’s ability to survive and

reproduce.

Humans have thousands of adaptations: large brain, opposable thumbs, excellent sensory organs, light, strong skeleton, etc.

Page 21: HAPPY TUESDAY Bellwork: Write down only the bolded red portion and your answer. Two species of mice live in a field in the middle of East Texas. One mouse

C. Natural selection: the process by which individuals with characteristics that are not well suited to their

environment either die or leave few offspring.

1. Also referred to as survival of the fittest.

2. It is not seen directly, but only observed as changes in a population over a long time.

3. Zombieland: The Rules