Transcript Natural Selection PPT

Natural Selection
Objective:
SWBAT Analyze animal adaptations and
the effects of natural selection with
examples in order to explain the term
“survival of the fittest” and natural selection
as the central idea of Darwinian Evolution
Introduction
Describe what is happening in figures 1-3. Is
the population of mice different in figure 3
than in figure 1? Explain why.
Notes – Right Page
Living things that are well adapted to their
environment survive and reproduce.
Those that are not well adapted don’t
survive and reproduce. An ___________
adaptation
is any characteristic that increases
________,
fitness which is defined as the ability
to survive and reproduce. What
characteristic of the mice is an adaptation
that increased their fitness?
Notes – Right Page
Natural Selection: the process by which
individuals that are better adapted to their
environment are more likely to survive and
reproduce than other members of the
same species
Natural Selection =
ENVIRONMENT CHOOSES
Natural Selection Activity
Table 2: “Event Cards”
Table 1: “Mouse Cards”
Number Label
Number Label
25
25
W
w
Meaning
Dominant allele
for white fur
Recessive allele
for brown fur
Meaning
5
S
Mouse Survives
1
D
Disease kills
mouse
P
Predator kills
mice of all
colors
C
Predator kills
mice that
contrasts with
the
environment
1
18
Activity
Mouse
Event
Environment 1: White Sand Environment
Live
W
Micew
W
w
Mouse
Mouse
Dead Mice
What color is the mouse’s fur? White
Does the mouse live or die?
Lives because it can blend in with the
white sand environment. Place
Mouse cards in “Live Mice” pile to
use for generation 2.
Event
C
Data Table
Type of Environment:
White Sand
Deaths
Generation
White Mice
Brown Mice
White Mice
1
2
3
Brown Mice
Activity
Mouse
Event
Environment 1: White Sand Environment
Live Mice
w
w
Mouse
Mouse
Dead
Mice
w
w
What color is the mouse’s fur? Brown
Does the mouse live or die?
Dies because it does not blend in with the
white sand environment. Place Mouse
cards in “Dead Mice” pile and DO NOT
reuse these cards for generation 2 and 3.
Event
C
Data Table
Type of Environment:
White Sand
Deaths
Generation
White Mice
Brown Mice
White Mice
1
2
3
Brown Mice
Activity
Mouse
Event
Environment 1: White Sand Environment
w
Live
Micew
w
w
Mouse
Mouse
Dead Mice
What color is the mouse’s fur? Brown
Does the mouse live or die?
Lives even though its fur is in contrast with
the environment, the EVENT card says
that it survives.
Event
S
Data Table
Type of Environment:
White Sand
Deaths
Generation
White Mice
Brown Mice
White Mice
1
2
3
Brown Mice
Activity
• Part 1: White Sand Environment (White)
– Complete “Mouse” Cards pile  First generation
– Take all cards from “Live Mice,” shuffle and repeat
activity for generations 2 & 3
– DO NOT use cards in Dead Mice pile (they are not
able to reproduce for future generations
– Correctly fill out Data Table in Interactive Notebook
• Part 2: Forest Floor Environment (Brown)
– Repeat activity but change the environment
– Correctly fill out Data Table in Interactive Notebook
Activity
Mouse
Event
Environment 2: Forest Floor Environment
wLive
w
Mice
w
w
Mouse
Mouse
Dead Mice
What color is the mouse’s fur? Brown
Does the mouse live or die?
Lives because it can blend in with
the forest floor environment. Place
Mouse cards in “Live Mice” pile to
use for generation 2.
Event
C
Data Table
Type of Environment:
Forest Floor
Deaths
Generation
White Mice
Brown Mice
White Mice
1
2
3
Brown Mice
Analyze and Conclude
• Answer Questions
– With group, complete answers #1-5 on
LEFT side of Interactive Notebook
Exit Ticket
• Turn in on a separate sheet of paper a 25 Word
Summary
Explain how natural selection leads to evolution.
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