Download Evolution

Monday, 11/7/16
Objectives
- SWBAT state Charles Darwin’s contribution to
science
- SWBAT describe the three patterns of biodiversity
noted by Darwin
Monday, 11/7/16
Agenda
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CRS Do Now
What is Evolution Video/ Discussion
16.1 Stop and Jot
Exit Ticket
Monday, 11/7/16
Exit Ticket
On a separate piece of paper, answer the following questions
with complete sentences.
• Who was Charles Darwin and what was his contribution to
science?
• What three kinds of variations among organisms did Darwin
observe during the voyage of the Beagle?
Tuesday, 11/8/16
Objectives
• SWBAT identify the conclusions drawn by Hutton
and Lyell about Earth’s history
• SWBAT describe Lamarck’s hypothesis of evolution
Tuesday, 11/8/16
Agenda
 CRS Do Now
 Darwin’s Voyage of Discovery (16.1) Quiz
 Read 16.2
Wednesday, 11/9/16
Objectives
• SWBAT escribe the conditions under which natural
selection occurs
• SWBAT explain the principle of common descent
Wednesday, 11/9/16
Agenda
 CRS Do Now
 Evolution PowerPoint
 Natural Selection Video
 Exit Ticket
Notes: Evolution By Natural Selection
• Natural selection occurs in
any situation in which more
individuals are born than
can survive (the struggle for
existence), there is natural
heritable variation
(variation and adaptation),
and there is variable fitness
among individuals (survival
of the fittest).
Natural Selection
• https://www.youtube.com/watch?v=AMtT5_AQmLg
Natural Selection
• Natural selection is the process
by which organisms with
variations most suited to their
local environment survive and
leave more offspring.
• In natural selection, the
environment—not a farmer or
animal breeder—influences
fitness.
Natural Selection- Example
• This hypothetical population of
grasshoppers changes over time as a
result of natural selection.
• Grasshoppers can lay more than 200
eggs at a time, but only a small
fraction of these offspring survive to
reproduce.
Natural Selection- Example
• Certain variations, called
adaptations, increase an individual’s
chances of surviving and
reproducing.
•
In this population of
grasshoppers, heritable variation
includes yellow and green body
color.
•
Green color is an adaptation:
The green grasshoppers blend into
their environment and so are less
visible to predators.
Natural Selection- Example
• Because their color serves
as a camouflage
adaptation, green
grasshoppers have higher
fitness and so survive and
reproduce more often
than yellow grasshoppers
do.
Natural Selection- Example
• Green grasshoppers become
more common than yellow
grasshoppers in this population
over time because more
grasshoppers are born than can
survive, individuals vary in color
and color is a heritable trait,
and green grasshoppers have
higher fitness in this particular
environment
Natural Selection
• Natural selection does not make
organisms “better.”
• If local environmental conditions
change, some traits that were once
adaptive may no longer be useful.
• If environmental conditions change
faster than a species can adapt to
those changes, the species may
become extinct.
Common Descents
• Darwin proposed that, over many
generations, adaptation could cause
successful species to evolve into new
species.
• Principle of common descent suggest
that, all species—living and extinct—
are descended from ancient common
ancestors.
• For evidence of descent with
modification over long periods of time,
Darwin pointed to the fossil record.
Wednesday, 11/9/16
Exit Ticket
On a separate piece of paper answer the following question.
• There are two types of worms. Worms that eat in the day time
(diurnal) and worms that eat at night (nocturnal) . If most birds
eat during the day time, which adaptation has a higher fitness?
Explain your reasoning.
Thursday, 11/10/16
Objectives
SWBAT explain how geologic distribution of species relates
to their evolutionary history
SWBAT how the fossil record, homologous structures, and
molecular evidence can be used to support the theory of
evolution.