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Transcript
Name ______________________________ Class ___________________ Date __________________ Skills Worksheet Directed Reading 11.2 Section: Meiosis Read each question, and write your answer in the space provided. 1. What is meiosis? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 2. Explain the difference between meiosis I and meiosis II. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 3. List the stages of meiosis in the order that they occur. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 4. What is crossing-over? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 5. What is independent assortment? During which phase(s) of meiosis does independent assortment occur and what is the significance of this process? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Biology 3 Meiosis and Sexual Reproduction Name ______________________________ Class ___________________ Date __________________ Directed Reading continued In the space provided, write the name of the stage of meiosis that is being described. _____________________ 6. The centromeres divide, and the chromatids move to opposite poles of the cell. _____________________ 7. The homologous chromosomes separate. The chromosomes of each pair are pulled to opposite poles of the cell by the spindle fibers. The chromatids do not separate at their centromeres. _____________________ 8. The chromosomes condense, and the nuclear envelope breaks down. Homologous chromosomes pair all along their length and then crossing-over occurs. _____________________ 9. After one division of the nucleus, a new spindle forms around each group of chromosomes. _____________________ 10. Individual chromosomes line up along the equator, attached at their centromeres to spindle fibers. _____________________ 11. A nuclear envelope forms around each set of chromosomes. Two cells undergo cytokinesis, forming haploid offspring cells. _____________________ 12. Individual chromosomes gather at each of the two poles. In most organisms, the cytoplasm divides, forming two new cells. _____________________ 13. The pairs of homologous chromosomes are moved by the spindle to the equator of the cell. The homologous chromosomes, each made up of two chromatids, remain together. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Biology 4 Meiosis and Sexual Reproduction