Transcript Evolution - FroggiWik

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I'm diggin' with my fingertips
I'm ripping at the ground I stand upon
I'm searching for fragile bones
Evolution
I'm never gonna be refined
Keep trying but I won't assimilate
Sure we have come far in time
watch the bow break
And I'm sorry that I don't believe
by the evidence that I see
That there's any hope left for me
It's evolution
Just evolution
And I, I do not dare deny
the basic beast inside
It's right here
It's controlling my mind
And why do I deserve to die
and I'm dominated by
This animal thats locked up inside
Close up to get a real good view
I'm betting that the species will survive
Hold tight, I'm getting inside you
Evolution
And when were gonna find these bones
They're gonna want to keep them in a jar
the number one virus caused by
Procreation
•
And the planet may go astray
in a million years they'll say
Those ****** were all derranged
It's evolution
Just evolution
And I, I do not dare deny
the basic beast inside
It's right here
It's controlling my mind
And why do I deserve to die
I'm dominated by
This animal thats locked up inside
Take a look around
Nothing much has changed
Take a look around
Nothing much has changed
Take a look around [x3]
Nothing much has changed
Take a look around [x2]
Nothing much has changed
Take a look around [x2]
Nothing much has changed
Take a look around
I, I do not dare deny
the basic beast inside
It's right here
It's controlling my mind
And why do I deserve to die
I'm dominated by
This animal that's locked up inside
Why
Why do I deserve to die?
Evolution
“Nothing in biology makes sense
except in light of evolution.”
T. Dobzhansky
So What does evolution mean
anyway?
• Evolution does not mean man evolved
from monkeys!!!!!!
• Evolution means that all species must
change over time in order to survive.
• Charles Darwin is credited with creating the theory of
evolution.
• His theory is based upon the variations seen among
members of a population and whether those
variations are favorable.
• If a variation is favorable to an organism, then it
becomes an adaptation. An adaptation is a feature
that allows an organism to better survive in its’
environment.
Other scientists who helped
shaped Darwin’s theories
• Most scientists in 1700’s were
rejecting idea that earth was only
6,000 years old
• Linneaus developed a
classification system for all types
of organisms known in the
1700’s--he grouped them based
upon similarities
• Buffon proposed that species
shared ancestors instead of
arising separately.
• Lamarck believed that changes in the environment
caused the organisms behavior to change, leading
to greater use or disuse of a structure or organ.
• The structure would then become larger or smaller
as a result and the organism could pass the
change to its’ offspring.
• Lamarck’s theory became known as the
inheritance of acquired characteristics. An
example would be giraffes necks growing longer to
reach leaves in trees.
• Today we know this is wrong
because of genetics.
Darwin’s Observations
• Darwin saw variation among organisms. Variation is
differences in a physical traits.
• Galápagos tortoises that live in areas with tall
plants have long necks and legs. Even the shells
allowed different feeding strategies.
• Darwin believed that variations were
adaptations.
• An adaptation helps an organism to survive.
– Species are able to adapt to their environment.
– Adaptations lead to genetic change in populations.
– Adaptations can be passed to offspring.
• Darwin found fossils of extinct animals that resemble
modern animals.
• This supported evolution and that animals adapt and
change over time.
Theory of Natural Selection
• Darwin conducted 20 years of research while
thinking about how evolution occurs & this
was in artificial selection
• The process by which humans change a
species by breeding it for certain traits is
artificial selection.
The Four Components of
Natural Selection:
1. Variation must be
3. Some variations must
become adaptations,
present in the
giving some
population, they
individuals an
are the basis for
advantage over
natural selection.
others. They are
2. There must be
“naturally selected” to
survive.
overproduction of
4. Over time these
offspring so that
adaptations are
there is competition
passed to more
for survival.
offspring in the
population & evolution
occurs.
• Natural selection can only act on the
variations organisms have (their physical
traits).
Evidence for Evolution
• Fossils show that organisms change
over time
Trilobites are
ancient marine
mammals are
commonly
found fossils in
places such as
Ohio.
The study of geography provides evidence of evolution.
– island species most closely resemble nearest mainland species
– populations can show variation from one island to another, because
different ecosystems favor different adaptations
Embryology provides evidence of evolution.
– Organisms that are very different as adults can be
very similar as embryos
– Embryos of vertebrates are had to tell apart
– Fish, birds, reptiles & mammals all have gill slits
as embryos
Larva
Adult crab
Adult barnacle
The study of anatomy provides evidence of evolution.
– Comparison of body parts of different species can
show evolutionary relationships
– Homologous structures are similar in structure but
different in function. Example: human hand, bat
wing, mole foot.
– Homologous structures are evidence of a common
ancestor.
Human hand
Mole foot
Bat wing
• Analogous structures have a similar
function, but not similar in origin.
Example bat wing & insect wing.
Human hand
Fly wing
Mole foot
Bat wing
• Vestigial structures are remnants of organs or
structures that had a function in an early ancestor.
• Examples are ostrich wings, pelvic bones and small
hind limbs in snakes, and the appendix in humans.