Natural Selection. 4.1.2 Outline the mechanism of natural selection as a possible driving force for speciation. What is evolution? What does it mean to you? Do you think it happens? Evidence? (for or against). http://evolution.berkeley.edu/evolibrary/article/evo_25. DEFINITIONS:.
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4.1.2 Outline the mechanism of natural selection as a possible driving force for speciation.
What does it mean to you?
Do you think it happens?
Evidence? (for or against)
Evolution are the changes in the gene pool of a population over time.
Natural selection process by which individuals that are better suited to their environment survive and reproduce most successfully.
Adaptation is an inherited characteristic that increases an organism’s chance of survival.
fruit and seed eaters
insect and nectar eaters
Based on his observations, Darwin proposed that EVOLUTION occurs by NATURAL SELECTION.
Mutations & Sexual reproduction produces variations among offspring.
Overproduction of offspring
Limited resources leads to a struggle for survival between offspring.
Survivors reproduce more successfully.
Population changes over time.
Can a fish species willfully grow limbs and fingers if they are needed to crawl out of the water onto dry land?
Individuals in Populations with Beneficial Genetic Traits Can Leave More Offspring
exposed to an antibiotic
Eventually the resistant strain
replaces the strain affected by
The genetically resistant bacteria
Most of the normal bacteria die
http://www.techapps.net/interactives/pepperMoths.swf (requires flash)
http://phet.colorado.edu/en/simulation/natural-selection (requires shockwave)