Download - Natural Selection Objective:
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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
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IntroductionDescribe what is happening in figures 1-3. Is
the population of mice different in figure 3 than in figure 1? Explain why.
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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 ___________ is any characteristic that increases ________, which is defined as the ability to survive and reproduce. What characteristic of the mice is an adaptation that increased their fitness?
adaptation
fitness
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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
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Natural Selection Activity
Table 1: “Mouse Cards”
Number Label Meaning
25 W Dominant allele for white fur
25 w Recessive allele for brown fur
Table 2: “Event Cards”Number Label Meaning
5 S Mouse Survives
1 D Disease kills mouse
1 PPredator kills
mice of all colors
18 C
Predator kills mice that
contrasts with the
environment
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Activity
Live Mice Dead Mice
Mouse Event
MouseMouse
wWWhat color is the mouse’s fur? White
Environment 1: White Sand Environment
Event C
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.
wW
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Data TableType of Environment:
Generation White Mice Brown Mice
Deaths
White Mice Brown Mice
1
2
3
White Sand
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Activity
Live Mice Dead Mice
Mouse Event
MouseMouse
wwWhat color is the mouse’s fur? Brown
Environment 1: White Sand Environment
Event C
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.
ww
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Data TableType of Environment:
Generation White Mice Brown Mice
Deaths
White Mice Brown Mice
1
2
3
White Sand
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Activity
Live Mice Dead Mice
Mouse Event
MouseMouse
wwWhat color is the mouse’s fur? Brown
Environment 1: White Sand Environment
Event S
Does the mouse live or die?Lives even though its fur is in contrast with the environment, the EVENT card says that it survives.
ww
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Data TableType of Environment:
Generation White Mice Brown Mice
Deaths
White Mice Brown Mice
1
2
3
White Sand
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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
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Activity
Live Mice Dead Mice
Mouse Event
MouseMouse
wwWhat color is the mouse’s fur? Brown
Environment 2: Forest Floor Environment
Event C
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.
ww
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Data TableType of Environment:
Generation White Mice Brown Mice
Deaths
White Mice Brown Mice
1
2
3
Forest Floor
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Analyze and Conclude• Answer Questions
– With group, complete answers #1-5 on LEFT side of Interactive Notebook
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Exit Ticket• Turn in on a separate sheet of paper a 25 Word
SummaryExplain how natural selection leads to evolution.
_______ _______ _______ _______ ______________ _______ _______ _______ ______________ _______ _______ _______ ______________ _______ _______ _______ ______________ _______ _______ _______ _______