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Preliminary draft: Frog dissection lab
Pre-lab Activity 1:
Student section
In the book, A Plague of Frogs, scientists performed many necropsies on deformed frogs. In your journal, respond briefly to each of the following:
- Define necropsy. Is dissection the same as necropsy? Why or why not?
- What are the values of necropsies? If the frogs are visually deformed externally, what further information can scientists gain from internal examinations?
- We dissect normal frogs. What is the value to us of this process? How would dissection assist the scientists who are studying the deformed frogs?
Be prepared to discuss these questions at the end of the work period.
Teacher section: You might want to utilize an open class discussion as a way to begin preparation for dissection, using the questions above as a jump-off point. It is perhaps advisable to check journals
for completeness (just add a frog stamp or sticker!) prior to the discussion to keep the students honest. A possible assessment rubric for student responses is listed below.
- 5 points--student has journal complete, responds orally to one or more questions during discussion.
- 4 points--student shows willingness to respond to questions during discussion by raising hand and answers question(s). Journal is complete.
- 3 points--student responds to question(s) when called upon, but does not volunteer. Journal is complete.
- 2 points--student does not participate in discussion. Journal is complete.
- 1 point--student does not participate in discussion. Journal is incomplete.
- 0 points--student is absent for activity
Pre-lab Activity 2:
Student section
Purpose: Write a sentence that states what you believe the purpose of this lab will be, based upon the discussion we had in class previously.
Materials: Worksheet with diagrams of external views of frog, human; pencil or pen, preserved frog specimen (optional--you could rely only on diagrams or use plastic models of frogs)
Procedure:
1. Examine the frog. Locate the structures listed below and label them on the frog diagram.
Head Appendages (front and rear)
Ear Digits ("fingers", "toes")
Eyes Thorax
Nares ("nostrils") Abdomen
Mandible (lower jaw)
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