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Overview:
Students "take a trip" to the Greater Antilles to figure out how the Anolis lizards on the islands might have evolved.Author/Source:
Collins, Jennifer Grade level:
9-12 Time:
Two class periods. Teaching tips:
Before beginning this lesson, students should understand that phylogenetic trees (cladograms) are hypotheses of how a set of organisms are related. Concepts:
Correspondence to the Next Generation Science Standards is indicated in parentheses after each relevant concept. See our conceptual framework for details. - Biological evolution accounts for diversity over long periods of time. (LS4.A, LS4.D)
- Traits that confer an advantage may persist in the population and are called adaptations. (LS4.B, LS4.C)
- Speciation is the splitting of one ancestral lineage into two or more descendent lineages.
- Speciation requires reproductive isolation.
- Occupying new environments can provide new selection pressures and new opportunities, leading to speciation. (LS4.C)
- Scientists test their ideas using multiple lines of evidence. (P6, NOS2)
- Scientists can test ideas about events and processes long past, very distant, and not directly observable.
- Scientific knowledge is open to question and revision as we come up with new ideas and discover new evidence. (P4, P6, NOS3)
- Scientists use multiple research methods (experiments, observational research, comparative research, and modeling) to collect data. (P2, P3, P4, NOS1)
- Science is a human endeavor. (NOS7)
- Our knowledge of the evolution of living things is always being refined as we gather more evidence.
- Our understanding of life through time is based upon multiple lines of evidence.
- Scientists use the similarity of DNA nucleotide sequences to infer the relatedness of taxa. (LS4.A)
- Scientists use anatomical evidence to infer the relatedness of taxa. (LS4.A)
- Scientists use the geographic distribution of fossils and living things to learn about the history of life.
- Scientists use experimental evidence to study evolutionary processes.
- Classification is based on evolutionary relationships.
- Evolutionary trees (i.e., phylogenies or cladograms) are built from multiple lines of evidence.
- Scientists may explore many different hypotheses to explain their observations. (P7)
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