Download Darwin v. Lamarck - Thomas C. Cario Middle School

HA HA!!
Key Terms:
• There are ____________ among species of similar
populations.
• ___________ Traits are traits an organism obtains
within its life; ex. Learning to play the piano.
• ___________ Traits are traits an offspring gets passed
from the parent through DNA; ex. Eye color.
• ___________ are slight differences from parent to
offspring because of a change in DNA.
• An ___________ is a trait or behavior that helps an
organism survive and reproduce.
• ______________ is the change in a species over time.
Variations, acquired, genetic, mutations, adaptation, evolution
Lamarck: Inheritance of Acquired Traits
(1st proposed Theory)
• Frequent and vigorous
use of a body part led
to a slight increase in
its size (acquired trait).
• Ex: Muscles, wings,
tails, necks, etc.
• That acquired trait is
passed on to the
offspring.
Due to the discovery of genetics…
• Scientists learned __________ traits could
NOT be passed on to offspring.
• ONLY, ____________ traits (DNA).
• Example: If a parent lifts weights often and
obtains large muscles, the large muscles will
not be passed to the offspring.
Acquired, genetic
Darwin/ Wallace: Natural Selection
“Survival of the fittest”
(Theory supported today)
• _____________ of a particular
species occur naturally, due to
____________.
• Some are more beneficial to
surviving in the environment .
• The individuals with the
__________ traits more
beneficial to the environment
are more likely to survive and
reproduce offspring with
those traits.
Variations, mutations, genetic
Examples of traits/adaptations helpful
in survival …
Structural or Behavioral?
• Protective Coloration
• Migrating
• Large Beak
• Mimicry
• Playing Dead
S, B, S, S, B
Natural Selection Crash Course
After watching the video, describe how
the peppered moth is an excellent
example for Natural Selection.
Be sure to use the following key terms:
variation, mutation, genetic trait,
offspring, best suited
Example Answer:
• The Peppered moth is an excellent example of
natural selection. The moth population had a
mutation in coloring which lead to variation
among the species. The dark moth was best
suited when the environment became
polluted. So, it passed the genetic trait to its
offspring.
After observing the simulation,
describe how the “beetles” are an
example of Natural Selection.
• http://sciencenetlinks.com/media/filer/2011/
10/07/evolution.swf
Example Answer:
• The beetles represent natural selection
because the green/orange beetle best suited
for the environment (non-polluted/polluted)
survived and reproduced like beetles.