Download - Changing Over Time
Changing Over Time
Rich Stein
Carolina: Inquiries in Science Series
• Kit is set up for 6 groups• Three Activities– Activity 1: Students compared relatedness of
species– Activity 2: Homologous vs. Analogous vs. Vestigial
Structures.– Activity 3: Evolution of Antibiotic Resistant
Bacteria• Cost: $149.95
Instructional Approach
1. Focus
2. Explore
3. Explain
4. Apply
Focus
• Activities designed to help students study the evidence of evolution.
• Homologous Structures: structures evolved from a common ancestor.
Focus
• Analogous Structures: Differ in form but are similar in function. Organisms adapted in similar ways.
Focus
• Vestigial Structures: Remaining components of structures that once served a function in an organism’s ancestor but useless today.
Explore
• Kinship Activity: Within each row list the species that does not belong.
• 1: Raccoon• 2: Shark• 3: Sponge• 4: Toadstool• 5: Amoeba• 6: Leech
Explore
• Changing Over Time Structure Cards– Brainstorm with your group into how to organize
your cards– Consider:• Function of structures• Shared structures• Shared functions
Explore
• Homologous Structures:– Pitcher plant, Venus flytrap, Red poinsettia, and cactus
• Analogous Structures:– Human Legs and Spider Legs– Butterfly wings and bird wings– Vertebrate cranium and the anterior exoskeleton of
beetles.• Vestigial Structures:– Hind bones of whales, wings of ostrich, Dandelion
flower (ovules develop into seeds, no pollen needed)
Explore
• Activity 3: You’ll need– Luria Broth with E. coli – Pipet– Prepared ACG agar plate
• “Ampicillin concentration gradient”
• Write your group name• Pipet three drops of luria broth onto the ACG plate.• Let the plate sit for 10 minutes, then place into 37o
incubator for 24 hours.
Apply
• You have at your disposal:– LB Agar Plates– LB Agar + Ampiciliin Plates– Blank sterile antibiotic disks– Design an experiment to test your hypothesis