Jigsaw activity:1.How does mutation lead to Adaptation?

2.What is Natural Selection?

3.Give an example of Natural Selection.

4.What is the Theory of Evolution?

5.What evidences support Evolution?

Questions NotesHow does mutation lead to Adaptation?

Give an example of Natural Selection.

What is Natural Selection?

What is the Theory of Evolution?

What evidences support Evolution?

Jig saw Activity: Adaptation, Natural Selection, and Evolution

Jigsaw activity:

1. How does mutation lead to Adaptation?

2. What is Natural Selection?

3. Give an example of Natural Selection.

4. What is the Theory of Evolution?

5. What evidences support Evolution?

On a piece of A3 paper, write a paragraph summary that answers your assigned question. Be ready to present your answers to your peers.

GENETIC VARIATION

leads to

Adaptation

1

Fig. 22.11. Some spectacular adaptations.

Adaptation• Adaptation is a long evolutionary process

where a population becomes better suited to its habitat.

Feature which is especially important for an organism's survival.

Such adaptations are produced by the better suited forms reproducing more successfully, which is natural selection.

Horse’s teeth

Adaptation is driven by

Natural Selection

2

There are 2 variations of the beetles, green and red.

The birds prefer eating the green beetles.

Over generations the red beetles increase in population because they are not eaten by the birds.

More survive to produce more offspring.

Over time the red beetles have been selected over the green beetles

Generations later….

An Example of Natural Selection

3

Giraffe you tube video

How did giraffe’s develop their long necks?

Change through use and disuse

Incorrect model of evolution

Natural Selection’s Explanation

Ancestors had different neck lengths

Through natural selection, longer necks survived and passed on their genes.

Eventually all giraffes had long necks.

Theory of Evolution

4

Evolution • Evolution is the change in the inherited traits

(passed on from parents to offspring) of a population over many generations. These traits could be physical, chemical or behavioral.

This change is caused by mutations in the genes.

Video Clip: http://www.youtube.com/watch?v=yVqJ_mQazik

How does Evolution Work?Natural Selection(survival of the fittest) is simply the logical

result of four features of living systems:

INHERITANCE

SELECTIONsome variants reproduce more than

others

TIME successful variations accumulate over many generations

VARIATION

Individuals in a population vary from one another (different genes caused by mutations) parents pass on their traits to

their offspring genetically

Evidences supporting Evolution

5

Similarities in Genetic Code

•225 Million Years Ago the continents were together making a super continent called Pangaea

•When the continent began to split populations were separated.

• This increased the variety of living things because they all had to adapt to different and new

environments and habitats.

ONE A Common Ancestor

SIMILARITIES IN STRUCTURES