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Modeling meiosis
1.
Name
Class Date Chapter 11 Introduction to Genetics Exploration Modeling Meiosis Meiosis results in 4 new cells, each containing half the number of chromosomes in the original cells. Using the procedures below, you will build a model to demonstrate the process of meiosis and explore how it can lead to genetic changes. Problem What happens to the chromosomes in cells during meiosis? Materials • 4 colors of yarn (2 shades of red and 2 shades of green) • scissors • transparent tape • index cards • felt-tip marker Skills Using Models, Communicating Results Procedure 1. You will use yarn and index cards to model each stage of meiosis. Use 2 shades of red yarn to represent one homologous pair of chromosomes and 2 shades of green yarn to represent another pair. Use an index card to represent a cell. 2. Cut 2 pieces of yarn about 5 cm long from each color of yarn. Each piece of yarn will represent a chromatid. 3. Tape pieces of red and green yarn to an index card to show the © Pearson Education, Inc. All rights reserved. appearance of two tetrads in a cell at the beginning of meiosis. Yarn 14 Teaching Resources /Chapter 11
2.
Name
Class Date 4. Tape pieces of yarn to additional index cards to model the numbers and positions of the chromosomes and cells at each stage of meiosis. Be sure to include an example of crossing-over at the correct stage. Use a felt-tip marker to label each card with the name of the stage it represents. Crossing-over 5. Arrange the finished cards to show the complete process of meiosis. Label the stages at which genetic segregation and crossing-over occur and chromosome number changes. 6. Use your cards to explain the process of meiosis to a classmate. Then, trade roles and have your classmate use his or her models to explain the process of meiosis to you. Analyze and Conclude 1. Using Models What is the result of the first meiotic division (meiosis I)? © Pearson Education, Inc. All rights reserved. 2. Using Models What is the result of the second meiotic division (meiosis II)? Teaching Resources /Chapter 11 15
3.
Name
Class Date 3. Drawing Conclusions How does meiosis lead to increased genetic variation? 4. Predicting How would the gametes be affected if a pair of chromatids failed to separate in the second meiotic division? © Pearson Education, Inc. All rights reserved. 16 Teaching Resources /Chapter 11
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