Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
MEIOSIS COMPREHENSION CHECK Materials: a) 15 cells each represented by a large note card b) Glue c) One background sheet on which to glue the notecards d) An envelope containing 17 pieces of four different colors of yarn each. If your teacher counted correctly, all pieces of yarn will be used by the end of the activity. 1. The parent cell (the one that will go through mitosis) has 4 chromosomes, one of each of the colors 2. Using your note cards and yarn, make a model of the different cells a) the parent cell b) the same cell in Prophase I c) “ Metaphase I d) “ Anaphase I e) “ Telophase I f) “ Prophase II g) “ Metaphase II h) “ Anaphase II i) “ Telophase II Label each card with the correct name that it represents Remember, the goal of meiosis is to end up with four cells having half of the number of chromosomes as the parent cell. 3. On your model show crossing over 4. Use a pencil or pen to indicate if a nuclear membrane Is around the “yarn” chromosomes. Remember, the nuclear membrane is not always present in the cell so as to allow for chromosome movement. 5. Sketch in the presence of spindle fibers if present during a stage of meiosis. 6. Next to each “cell” write a description of what is occurring at that stage WHEN FINISHED, CALL THE TEACHER TO YOUR GROUP _________________ Name ________________________________ Meiosis Lab Date ___________________ Per. _________ Question: What do the different stages of meiosis look like? Research: 1. What is the difference between haploid and diploid? ____________________________________________________ __________________________________________________________________________________________________ 2. What is the purpose of meiosis? _____________________________________________________________________ __________________________________________________________________________________________________ 3. True or False. DNA replication occurs during meiosis. ____________________________________________________ 4. What is a tetrad? _________________________________________________________________________________ __________________________________________________________________________________________________ 5. Describe crossing-over. _________________________________________________________________________ __________________________________________________________________________________________________ 6. What are the principal differences between mitosis and meiosis? __________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ Prediction: _______________________________________________________________________________________ __________________________________________________________________________________________________ Observations: Place a Lilium anthers, 1st meiotic div, slide and focus under high power. Diagram these two stages: Metaphase I Anaphase I Place a Lily Anthers, second division, slide and focus under high power. Diagram these two stages: Metaphase II Anaphase II Did you observe a difference in the “number” of chromosomes between your first diagrams and your second? __________________________________________________________________________________________________ Analysis & Conclusion 1. If a somatic, body, cell contains 46 chromosomes. Would this cell be considered diploid or haploid? _____________ 2. How many chromosomes would a human haploid cell contain? ____________________________________________ 3. Where in the body does meiosis occur? _______________________________________________________________ __________________________________________________________________________________________________ 4. When an egg is fertilized, is the new cell haploid or diploid? _______________________________________________ How many chromosomes does it contain? _______________________________________________________________ 5. If an organism has 6 total chromosomes in each somatic cell, how many pairs of homologous chromosomes does it have?_____________________________________________________________________________________________ 6. How many possible combinations of chromosomes are there in its gametes? _________________________________ Show your Work 7. How many possible combinations are there in a human gamete? ___________________________________________ Show your Work 8. What is the significance of crossing over? ______________________________________________________________ __________________________________________________________________________________________________ 9. A dog is 2N=78. How many are in its gametes? _________________________________________________________ 10. A cabbage has 18 chromosomes for its diploid number. How many are in its gametes? ________________________ 11. Mitosis Meiosis I Meiosis II Where it occurs (Type of cells) Prophase Metaphase Anaphase Telophase 12. How does meiosis lead to genetic variation? __________________________________________________________ __________________________________________________________________________________________________ 13. How would the gametes be affected if a pair of chromatids failed to separate in the second meiotic division? ______ __________________________________________________________________________________________________ 14. What parts of the cell did the yarn represent? _________________________________________________________