jigsaw activity: how does mutation lead to adaptation ? what is natural selection ?
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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.
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
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