University of California Early Frog Model Worksheet

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Look carefully at the set of frog models. Answer the following questions. Examine the earliest (fertilization) stages. Identify the animal and vegetal poles of the embryo: a. locate the site of sperm entry. Notice what the egg looks like at this stage. In what hemisphere (animal or vegetal) is the egg’s nucleus located? b. in what hemisphere is the yolk principally located? Now examine the models showing cleavage: a. what type of cleavage occurs in the frog (holoblastic or meroblastic)? b. in what region of the egg do the first two cleavages initiate? What is the orientation of the second cleavage with respect to the first? c. Is a cleavage always completed before the next cleavage starts? (Hint: Look at the eight cell and 16 cell stages to answer this question) d. What is the orientation of the third cleavage relative to the first two? e. Are all the cells (blastomeres) resulting from these early cleavages the same size? f. Thinking about the last set of questions, the presence and distribution of what substance explains the particular pattern of cleavage in the frog? Explain why this substance has this effect. Now examine the later cleavages through the morula and blastula stages. Then making sure the models associated with gastrulation are all in the same orientation, follow the paths of the different cells during gastrulation: a. Name and describe the three types of movements which occur during gastrulation. Which cell types undergo each movement? b. What new structures are present at the end of gastrulation?

Grid View

	Excellent	Good	Fair	Poor
Main Posting	45 (45%) – 50 (50%) Answers all parts of the discussion question(s) expectations with reflective critical analysis and synthesis of knowledge gained from the course readings for the module and current credible sources. Supported by at least three current, credible sources. Written clearly and concisely with no grammatical or spelling errors and fully adheres to current APA manual writing rules and style.	40 (40%) – 44 (44%) Responds to the discussion question(s) and is reflective with critical analysis and synthesis of knowledge gained from the course readings for the module. At least 75% of post has exceptional depth and breadth. Supported by at least three credible sources. Written clearly and concisely with one or no grammatical or spelling errors and fully adheres to current APA manual writing rules and style.	35 (35%) – 39 (39%) Responds to some of the discussion question(s). One or two criteria are not addressed or are superficially addressed. Is somewhat lacking reflection and critical analysis and synthesis. Somewhat represents knowledge gained from the course readings for the module. Post is cited with two credible sources. Written somewhat concisely; may contain more than two spelling or grammatical errors. Contains some APA formatting errors.	0 (0%) – 34 (34%) Does not respond to the discussion question(s) adequately. Lacks depth or superficially addresses criteria. Lacks reflection and critical analysis and synthesis. Does not represent knowledge gained from the course readings for the module. Contains only one or no credible sources. Not written clearly or concisely. Contains more than two spelling or grammatical errors. Does not adhere to current APA manual writing rules and style.
Main Post: Timeliness	10 (10%) – 10 (10%) Posts main post by day 3.	0 (0%) – 0 (0%)	0 (0%) – 0 (0%)	0 (0%) – 0 (0%) Does not post by day 3.
First Response	17 (17%) – 18 (18%) Response exhibits synthesis, critical thinking, and application to practice settings. Responds fully to questions posed by faculty. Provides clear, concise opinions and ideas that are supported by at least two scholarly sources. Demonstrates synthesis and understanding of learning objectives. Communication is professional and respectful to colleagues. Responses to faculty questions are fully answered, if posed. Response is effectively written in standard, edited English.	15 (15%) – 16 (16%) Response exhibits critical thinking and application to practice settings. Communication is professional and respectful to colleagues. Responses to faculty questions are answered, if posed. Provides clear, concise opinions and ideas that are supported by two or more credible sources. Response is effectively written in standard, edited English.	13 (13%) – 14 (14%) Response is on topic and may have some depth. Responses posted in the discussion may lack effective professional communication. Responses to faculty questions are somewhat answered, if posed. Response may lack clear, concise opinions and ideas, and a few or no credible sources are cited.	0 (0%) – 12 (12%) Response may not be on topic and lacks depth. Responses posted in the discussion lack effective professional communication. Responses to faculty questions are missing. No credible sources are cited.
Second Response	16 (16%) – 17 (17%) Response exhibits synthesis, critical thinking, and application to practice settings. Responds fully to questions posed by faculty. Provides clear, concise opinions and ideas that are supported by at least two scholarly sources. Demonstrates synthesis and understanding of learning objectives. Communication is professional and respectful to colleagues. Responses to faculty questions are fully answered, if posed. Response is effectively written in standard, edited English.	14 (14%) – 15 (15%) Response exhibits critical thinking and application to practice settings. Communication is professional and respectful to colleagues. Responses to faculty questions are answered, if posed. Provides clear, concise opinions and ideas that are supported by two or more credible sources. Response is effectively written in standard, edited English.	12 (12%) – 13 (13%) Response is on topic and may have some depth. Responses posted in the discussion may lack effective professional communication. Responses to faculty questions are somewhat answered, if posed. Response may lack clear, concise opinions and ideas, and a few or no credible sources are cited.	0 (0%) – 11 (11%) Response may not be on topic and lacks depth. Responses posted in the discussion lack effective professional communication. Responses to faculty questions are missing. No credible sources are cited.
Participation	5 (5%) – 5 (5%) Meets requirements for participation by posting on three different days.	0 (0%) – 0 (0%)	0 (0%) – 0 (0%)	0 (0%) – 0 (0%) Does not meet requirements for participation by posting on 3 different days.
Total Points: 100

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