Name: ____________________________________________________ Date: ________________________
1. What is meiosis and where does it occur?
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2. Describe fertilization and what happens to the chromosome number during this event.
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3. What are homologous chromosomes?
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4. Describe each phase of Meiosis I.
Prophase I
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_____________________________________________________________
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Metaphase I
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_____________________________________________________________
_____________________________________________________________
Anaphase I
_____________________________________________________________
_____________________________________________________________
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Telophase I & Cell Division
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_____________________________________________________________
_____________________________________________________________
5. Describe each phase of Meiosis II.
Prophase II
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_____________________________________________________________
_____________________________________________________________
Metaphase II
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
Anaphase II
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
Telophase II & Cell Division
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
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6. What is crossing over and when does it occur in meiosis?
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_________________________________________________________________________________________________
7. Draw a simple diagram of chromosomes that are crossing over.
8. Explain the role of meiosis in creating variation in offspring and in species.
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9. Compare the processes of mitosis and meiosis.
Mitosis Meiosis
_____________________________________________ _____________________________________________
_____________________________________________ _____________________________________________
_____________________________________________ _____________________________________________
_____________________________________________ _____________________________________________
_____________________________________________ _____________________________________________
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Use these activities to
• Review the sequence of the events of meiosis
• Practice recognizing cells in different phases of meiosis
In this lab you will build each phase of meiosis by arranging the chromosomes and cell parts in the cell.
1. Follow the Instructions at the top left to help you move through this investigation.
2. Drag and drop the correct cell parts into the blank cell outline to build each phase.
If you need to erase an image, click on the eraser button and then on the cell part you would like to erase.
If you want to erase all cell parts that you have placed on the screen, then click the clear all button.
3. Once you've constructed a phase, you have the option of clicking on the self check button at the top right.
This displays a sample cell in the current phase and allows you to check your work. Keep in mind that the cell you built might not look exactly like the self check image; use the self check as a guide to checking your understanding of what is happening in each phase.
4. Click on the next button to move forward through the phases of meiosis.
5. Once you complete Meiosis I, click on the Meiosis II button, which will allow you to continue building the phases of Meiosis II.
6. If you would like a picture of the cell phase that you built, click on the print screen button.
Draw each phase of Meiosis.
Prophase I Metaphase I
Anaphase I Telophase I
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Cell Division
Prophase II
Metaphase II
Anaphase II
Telophase II
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Cell Division
1. When did crossing-over occur? What happened during crossing-over?
____________________________________________________________________________________________________
____________________________________________________________________________________________________
2. Summarize what happened to the homologous pairs during Meiosis I:
____________________________________________________________________________________________________
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3. Summarize what happened to the chromosomes during Meiosis II:
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____________________________________________________________________________________________________
4. Are the four sex cells at the end of Telophase II genetically different from each other? Explain.
____________________________________________________________________________________________________
____________________________________________________________________________________________________
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anaphase I: _________________________________________________________________________________________
________________________________________________________________________________________________
anaphase II: _________________________________________________________________________________________
________________________________________________________________________________________________
centromere: _________________________________________________________________________________________
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chromatids: _________________________________________________________________________________________
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chromosome: _______________________________________________________________________________________
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crossing-over: ______________________________________________________________________________________
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DNA: _______________________________________________________________________________________________
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fertilization: _________________________________________________________________________________________
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homologous chromosomes: __________________________________________________________________________
________________________________________________________________________________________________
meiosis: ____________________________________________________________________________________________
________________________________________________________________________________________________
mitosis: _____________________________________________________________________________________________
________________________________________________________________________________________________
metaphase I: ________________________________________________________________________________________
________________________________________________________________________________________________
metaphase II: _______________________________________________________________________________________
________________________________________________________________________________________________
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nucleus: ____________________________________________________________________________________________
________________________________________________________________________________________________
prophase I: __________________________________________________________________________________________
________________________________________________________________________________________________
prophase II: _________________________________________________________________________________________
________________________________________________________________________________________________
sex cell: ____________________________________________________________________________________________
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sexual reproduction: _________________________________________________________________________________
________________________________________________________________________________________________
spindle fibers: _______________________________________________________________________________________
________________________________________________________________________________________________
telophase I: _________________________________________________________________________________________
________________________________________________________________________________________________
telophase II: _________________________________________________________________________________________
________________________________________________________________________________________________
zygote: _____________________________________________________________________________________________
________________________________________________________________________________________________
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