NATURAL SELECTION

K W LWhat do you already know about evolution and natural selection?

What do you want to know about evolution and natural selection?

What did you learn from our lab “Survival of the Beakest”?

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….

So what happens to the birds now?

Natural Selection Simulationhttp://phet.colorado.edu/en/simulation/natural-selection1) Why are there different colors? 2) Why do wolves eat white rabbit (in the

equator environment)?

3) Why do # brown rabbits increase over time?

4) What is it called when the # brown rabbits increases over time?

5) What if the environment changed to the arctic?

mutation

Brown are camouflaged or move faster

Brown survive, reproduce & their babies are brown

Evolution

The white rabbits would survive better and the # white bunnies would increase

Why do giraffes have long necks?

Who was Charles Darwin?•British scientist that in 1859 published The Origin of Species

•Stated that all life today came from a common ancestor•Change from one to many is called evolution•This happens by a process called natural selection.• http://www.youtube.com/watch?v=nMgLF8n4DnA

Voyage of H.M.S. Beagle, 1831 - 1836

DarwinGalapagos

90 feet of ship, 74 people living together for 5 years...

PHYSICAL: This moth mimics an owl’s eyes

CHEMICAL: this orchid smells like a female bee

BEHAVIORAL: This monkey is using tools to get food

INCORRECT MODEL OF EVOLUTION: BASED ON NEED

Change through use and disuse

Why does this not work?

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.

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

•The continents split and populations were separated.

•This increased the variety of living things because they were in new environments,which would select for specific adaptations and isolated these species from reproducing with original form.

EFFECTS OF ISOLATION

http://www.youtube.com/watch?v=sCEeefdaRcw

ONE Ancestor Many Varieties

• What are the different types?

•What could cause all the variety?

Common Ancestor-We did not come from monkeys, we just share a common ancestor

Adaptationthe evolutionary process where a population becomes better suited to its environment.This process takes many generations.

A feature which is especially important for an organism's survival.

For example, the adaptation of horses' teeth to the grinding of grassFlat teeth (due to genetic mutation) chew

grass better

How does Evolution Work?Natural Selection- survival of the fittest

Organisms best suited to their environment

Natural selection is the result of four features of living systems:

1) variation – differences in the population because of genetic mutation

2) inheritance - parents pass on their genetic mutations to their offspring

3) selection - some organisms reproduce more (fittest) than others

4) time – happens over time, takes many generations

Evolution the change in the inherited traits

(passed on from parents to offspring) of a population over many generations. These traits could be:

physical (teeth shape) chemical (ability to use sun for energy) behavioral (run fast).

This change is caused by mutations in the genes.

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

Theories on LifeTheory of EvolutionScienceBased on evidence

CreationismReligionBased on faith