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Transcript
Name _________________________________ DISSECTING FROG EVOLUTION External Anatomy Why are trees tall? Why do zebras have stripes? Who do cheetahs have long, narrow legs? These questions can all be answered using Darwin’s theory of evolution by natural selection. In fact, virtually every trait of an organism can be explained using natural selection theory. While learning the anatomy of a frog you will use Darwin’s theory to explain why the animal and its structures take the form that they do. For the features in the table make and record descriptive observations. Then infer the adaptive value of the feature – attempt to describe how the feature makes the frog better adapted for its environment. Dorsal color Ventral color Location of eyes Location of ears Location of nostrils Shape of head Shape of tympanic membrane (ear) Vomerine teeth Hind legs – form, length Feet – form Other Part II - Explanations In a paragraph explain why a frog looks the way it does. Why is it colored the way it is? Why is it shaped the way it is? Why are structures located where they are? Refer to specific structures and use the language of natural selection theory. Student pages Name______________________________________ DISSECTING FROG EVOLUTION Thoracic Cavity Fill in the table after you have opened the frog’s thoracic (chest) cavity. Structure/Feature Ribs Observations Adaptive Value Lungs Pericardial membrane Number of heart chambers Other Part II – Explanations Explain why amphibians have a 3-chambered heart whereas fish only have 2 chambers. You may need to use book or web resources to acquire some information on the topic. Use natural selection theory to develop your explanation. Student pages Name________________________________________ DISSECTING FROG EVOLUTION Abdominal Cavity Fill in the table after you have opened the frog’s abdominal cavity. Structure/Feature Shape, texture of stomach Observations Adaptive Value Size of liver Length of small intestine Body cavity Villi Number of blood vessels in mesentery Number of eggs (in pregnant female) Other Part II – Explanations Choose 3 features from the abdominal cavity and explain why they are the way they are in a frog. Use natural selection theory to develop your explanations.