Download Aim #74 - Manhasset Schools

Date: April 18, 2016
Aim #74: How does adaptive variation lead to survival of an
organism?
Do Now: Warm-Up Notebook
Date
Title of Activity
4/11
Phylogenic Tree
HW:
1)Unit 7d due Friday, April 22nd
• Do not forget Castle Learning!!
Page #
Aim #74: How does
adaptive variation lead to
the survival of an organism?
1) Variation
DIFFERENCES (in structure and or
behavior) within a population
2) What produces variations?
• Sexual reproduction
recombination of
genes
• Meiosis
• Crossing over
• Independent
assortment –
different gametes
made by one parent
• Mutations
3) Why are variations important to a
population?
• Variation in a species
increases the chances
that some members
will survive an
environmental
change.
• Why is this important?
Peppered Moth (~2 minutes)
https://www.youtube.com/watch?v=LyRA807djLc
4) For example: The peppered moth
5) Adaptation
A variation that allows an organism to
survive in it’s environment
6) Adaptive Variation
A variation that
allows you to
survive a
changing
environment
7) What would happen to a
population with variation if
the environment changed?
• Those who had
an adaptive
variation would
survive. Those
that don’t will
die. This would
lead to ….
EVOLUTION
8) What would happen to a
population that did not have
variation?
• If they don’t posses
a trait that allows
them to adapt to a
changing
environment, they
will die out:
EXTINCTION
9) What is the theory of evolution?
•
Theory – well tested
conclusion that has
been accepted by the
scientific community.
• Evolution :
1) The process by which
species change over
time.
2) Present day species
are related to ancient
species.
Summary Questions:
1) The driving force behind evolution is the
interaction between the individual organisms and
the __________.
2) In your own words, define what an adaptive
variation is?
3) Explain what the following statement means,
“Individual organisms do not evolve, species do”.