Punnet Squares By Mr. Derrik Netten
| Introduction In this activity you will learn about Punnett squares. Punnett squares are an important tool in determining what kind of offspring two parents will produce, it also shows the possibilities of traits that can be passed on. Thus, Punnett squares are a very important factor in determining heredity, as well as in the study of genetics. |
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Task Your task is to surf the web and learn more about Punnett squares. By doing this you will learn what the possibilities are that some traits will be passed on from one generation to another. As an individual student you will be a member of a group of three. Each member of your group will have an individual role amongst the group. The roles in which you can choose from are: surfer, journalist, and examiner. You must define the key terms as well as answer the questions. Surfer This individual is in control of the computer and gets to surf the web looking for the answers to the questions. Your job is to find the definitions of key terms, as well as finding the answers to the questions below. Journalist This individual is in charge of writing down the definitions of the key terms. It is essential that this member has good hand writing. Use the resources listed below to assist you in defining the key terms. Examiner This member of the group is in charge of writing down the answers to the questions. In order to answer the questions below, as a group you must surf the web using the resources that I have provided. It is important that you all work together as a group to accomplish the task at hand. Just because you are assigned an individual role, does not mean that you can not help your other group members. Remember, you are a group and you must work together. |
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| Key Terms Heterozygous, homozygous, genotype, phenotype, dominant, recessive, trait, genetics, and inherit Questions 1. What is a Punnett square? 2. What is the difference between heterozygous and homozygous? 3. Define the words dominant and recessive using a regular dictionary. Then compare these common definitions with their science definitions. Are they similar or different? 5. Who are Punnett squares named after? 6. Provide two examples of an inherited trait. 7. Use a Punnett square to assist you in solving this question. You are crossing two heterozygous purple flowers. In certain flowers purple is dominant over white, use P for the purple gene and p for the white gene. Out of the four flowers, how many are purple? White? 8. What are three things that you have learned from this Webquest? |
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Resources 1. http://www.knowledgene.com/public/view.php3?db=fun_stuff&uid=50#2 2. http://7-12educators.about.com/blwarmsci11.htm 3. http://www.m-w.com 4. http://www.liverpool.k12.ny.us/standards/lstandards/curriculum/sci/g6sci/punnett.html 5. http://www2.gsu.edu/~mstnrhx/worksheet.htm 6. http://library.thinkquest.org/18258/noframes/punnettsquares.htm |
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Process 1. Decide who is going to play each role. 2. Surf the web looking for the definitions to the key terms. 3. The journalist must write down the definitions. 4. Surf the web searching for the answers to the questions below. 5. The examiner must write down the answers to the questions. 6. As a group, decide what were the three most important things you learned, then have the examiner write down your response. Conclusion After knowing what a Punnett square is, you will be able to determine what possible gene combinations can be passed from parents to offspring. Knowing the key terms will assist you in learning about Punnett squares. |
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