2. Essential Knowledge
• 1A1: Natural selection is a major mechanism
of
evolution.
• 1A2: Natural selection acts on phenotypic
variations.
• 1A3: Evolutionary change is also driven by
random processes
3. Evolution
• Change in genetic makeup of a population over
time.
• Natural selection is its major driving
6. Darwin
said…
• Competition for limited resources
results in differential survival.
What’s
wrong with
this picture
though???
7.
8. Natural Selection
•Individs w/ more favorable phenotypes
(physical features) are more likely to survive
and produce more offspring, passing down
traits to subsequent generations!
16. Genetic Variation is Good For You!
• A diverse gene pool is important for
survival of a species in a changing
environment.
17. Adaptation
• A genetic variation that is favored by selection and
provides an advantage to an org. in a environment.
• Occurs naturally through environmental
pressures.
18. • Chance and random events (genetic
drift) can also influence the
evolutionary process, especially for
19. What is Going to Happen to this Small
Population, thanks to Genetic Drift?
20. Natural Selection Acts on
Phenotype
• Environments may change and act as a
selective mechanism on populations.
