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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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Introduction Describe 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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Natural Selection = ENVIRONMENT CHOOSES
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 w Recessive allele for brown fur Table 2: “Event Cards” Number Label Meaning 5 S Mouse Survives 1 D Disease kills mouse P Predator kills mice of all colors 18 C Predator kills mice that contrasts with the environment
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Environment 1: White Sand Environment
Activity Event Mouse Environment 1: White Sand Environment Live Mice Dead Mice W w What color is the mouse’s fur? White W w 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. Mouse Mouse Event C
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Data Table White Sand Type of Environment: Generation White Mice
Brown Mice Deaths 1 2 3 White Sand
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Environment 1: White Sand Environment
Activity Event Mouse Environment 1: White Sand Environment Live Mice Dead Mice w w What color is the mouse’s fur? Brown w w 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. Mouse Mouse Event C
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Data Table White Sand Type of Environment: Generation White Mice
Brown Mice Deaths 1 2 3 White Sand
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Environment 1: White Sand Environment
Activity Event Mouse Environment 1: White Sand Environment Live Mice Dead Mice w w What color is the mouse’s fur? Brown w w Does the mouse live or die? Lives even though its fur is in contrast with the environment, the EVENT card says that it survives. Mouse Mouse Event S
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Data Table White Sand Type of Environment: Generation White Mice
Brown Mice Deaths 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
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Environment 2: Forest Floor Environment
Activity Event Mouse Environment 2: Forest Floor Environment Live Mice Dead Mice w w What color is the mouse’s fur? Brown w w 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. Mouse Mouse Event C
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Data Table Forest Floor Type of Environment: Generation White Mice
Brown Mice Deaths 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 Summary Explain how natural selection leads to evolution. _______ _______ _______ _______ _______
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