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Natural Selection

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Benjamin Perin

on 26 February 2014

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Transcript of Natural Selection

Evolution is the What.
Natural Selection is the How.

Another
Vestigial Structure:
Tailbone (coccyx)
"Vestigial
Structure"
One Example: Wolves to Dogs!
Evidence for
How evolution happens:
Variation
Heredity
Differential Reproductive
Success

+
Superfecundity
A
A
a
V
Selective Pressure
Is Evolution the process of "becoming more perfect?"
E V O L U T I O N
+
Process of
Natural Selection

JUST FIVE INGREDIENTS
Mr. Tucker: My Family Pet
Canus lupus:
Wild Animal!
Variation
Heredity
Superfecundity
Selective pressure / "Selective Advantage"

Differential Reproductive Success
+
____________________________
A
A
a
V
Variation
Hereditability
Superfecundity
Selective Pressure

Differential Reproductive Success

+
___________________________
What "selective advantage" did
the earliest Angler Fish have over its ancestors?
a. Better ability to hide from predators
than its ancestors.

b. Better ability to increase its caloric intake
than its ancestors.

c. Better ability to stay warm at deep ocean
depths than its ancestors.

d. Better ability to attract a mate than its
ancestors.
Case 3: Staphylococcus
Wrench = Antibiotic
Machinery = Protein-Making
Bacterial organelle
Causes
Skin Infections
A bacteria that grows all over the place.
resistance:
antibiotics
no longer work
What was the selective pressure
that caused Natural Selection in
the population of bacteria?
a) a poison in the environment

b) a scarcity of food (famine)

c) destruction of their habitat

d) global warming
Antibiotic
Resistant
Bacteria
Normal
bacteria,
sensitive to
antibiotics
What selective advantage did the
surviving bacteria have?
a) better ability to infect host

b) better ability to survive
dry environments

c) better ability to eat flesh (yuck!)

d) differently shaped ribosome
On the back of your handout,
List the 5 ingredients of Natural Selection
from memory.

on the back of your handout,
write a definition in your
own words for:

"Selective Pressure"

"Selective Advantage"
Case 2: The Anglerfish
A
A
a
V
How does resistance occur in the bacteria? (how do the bacteria evolve?)
So what's the big deal?
Benji's Favorite
"Vestigial structures are the muddy footprints of evolution"
-Benji
Environmental
change
Predators
Competition
for Scarce
Resources
(ribosome)
Thanks for your attention!
-Benji
PS: if you have any questions
about medical school, feel free to email me,
my email's on the handout.
Left over from a time when they were adaptive

Maybe our energy storage biochemistry is vestigial?
implies that natural selection is
a process that requires populations
ability to produce more way more offspring than could survive
Why isn't the earth
covered in toads?
Who's Malthus?
actually a good name
How will you remember
these five ingredients?
what examples of
selective pressure and
selective advantage have
we seen so far?
what is
heredity?
Full transcript