Dewlaps are flaps of skin beneath the chin that are extended and combined with head and body movements for visual signals and displays. This lesson serves as a supplement to the film . In this module, you will take measurements of lizards from species that vary in body morphology and ecological niche. BackgroundThe dewlaps of Anolis lizards provide a classic example of a complex signaling system whose function and evolution is poorly understood. The figure shows the six ecomorphs of anole lizards found in the Caribbean islands in their habitats. Analyze data from a phylogenetic tree and determine whether the data support a hypothesis. This is greatly hindered by the difficulty in resolving species trees using nuclear DNA from different loci and/or mitochondrial DNA. They exhibit extensive morphological variation and are one of two cladistic features uniting anoles, yet … The Origin of Species: Lizards in an Evolutionary Tree . Previous Taxonomic and Phylogenetic Hypotheses Four genera are traditionally recognized among anoles (Williams, 1976,1992): Anolis, containing >300 species, and Chamaeleolis, In this module, you will use DNA sequences of specific genes to create a phylogenetic tree of anole species to identify their phylogenetic relationships Module 3: Experimental Data. Published March 2014 Updated April 2015, May 2017 Page 1 of 10 Educator Materials USING DNA TO EXPLORE LIZARD PHYLOGENY . This activity explores the concepts and research on the anole lizards discussed in the short film The Origin of Species: Lizards in an Evolutionary Tree, including adaptation by natural selection, convergent evolution, and the formation of new species.. logenetic history may explain the inability of numerous studies to reconstruct a well-supported dichotomous phylogenetic tree. Module 2: Phylogeny. They have become a textbook example of adaptive radiation and have contributed greatly to our understanding of evolution, ecology and organismal function. Use sequence-alignment and phylogeny-generating software to compare mitochondrial DNA sequences. 11) Based on the phylogenetic tree, which lizards do you think are more closely related: those that live on the same island but in different habitats, or those that live on different islands but have the same body shape and live in the same type of habitat? In the evolution and ecology of higher organisms, phylogenetic trees are used to uncover the origins and adaptations of existing species. Anoles comprise one of the most diverse vertebrate genera, with nearly 400 species known and more being discovered every year. Explain how anole lizards in the Caribbean are examples of both adaptive radiation and convergent evolution. About 150 species occur on islands in the Caribbean; the rest are found in Central … This is "The Phylogenetic Tree of Anole Lizards — HHMI BioInteractive Video" by vjc.videos01 on Vimeo, the home for high quality videos and the people… What is an anole? ous branching of lineages early in anole phy? Anole Lizards. The phylogenetic relationships among species of anoles have been controversial for many decades (Guyer and Savage 1986, Cannatella and de Queiroz 1989, Guyer and … Explain using specific examples. Different types of anole lizards have evolved adaptations that enable them to be successful in different ecological niches—different parts of trees, grasses, and bushes. In this module you will look at the effect of habitat on convergence of traits. Lizards in an Evolutionary Tree. Anolis Lizards of the Greater Antilles: Using Phylogeny to Test Hypotheses Author: Jennifer (Johnson) Collins OVERVIEW STUDENTS “TAKE A TRIP” to the Greater Antilles to figure out how the Anolis lizards on the islands might have evolved. OVERVIEW . This film describes how the more than 700 islands of the Caribbean are home to about 150 species of anoles, a closely related group of lizards …

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