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1 Page 1 of 3 Terms to Know Asexual reproduction Asters (aster fibers) Cell cycle Cell plate Centromere Chiasmata Chromatid (sister) Chromatin Chromosomes Clone Crossing over Cytokinesis Daughter (cells, Diploid (2n) chromosomes, etc.) Fertilization Gamete Gentic Haploid (n) Homologous Homologs Interphase Karyotype Kinetochore Locus Meiosis Mitosis Oocyte (oöcyte) Polar Bodies Recombination Reduction division S phase Sexual reproduction Somatic cells Spermatocyte Spindle (spindle fibers) Synapsis Tetrad Zygote Stuff to Know Know each of the following 10 stages of meiosis, their correct order and the processes that occur during each (note: these are not in correct order): anaphase 1 telophase 1 interphase 1 prophase 1 metaphase 1 anaphase 2 telophase 2 interphase 2 prophase 2 metaphase 2 Know when DNA replicates. Know what daughter cells are. Know when chromosomes become visible. Know when formation of new cell wall or cell membrane occurs. Know when nuclear membrane disappears. Know when chromosomes line up in the middle of the cell. Know when the chromosomes pull apart. Know the number of meiotic divisions and number of chromosomes in each. Be able to correctly label/identify drawings of meiosis. Be able to correctly label/identify drawings of spermatogenesis and oögenesis. Understand uneven cytoplasm division. Know why and when crossing over occurs in chromosomes. Know the difference between haploid and diploid.

2 Page 2 of 3 1. What is the difference between a haploid and diploid cell? 2. For each of the following state if the cell is haploid or diploid. Sperm cell = Liver cell = Egg cell = Stomach cell = 3. If the diploid number in a liver cell is 52, how many chromosomes are there in the egg of this organism? 4. The combination of a human and an produces a zygote with 46 chromosomes. 5. During meiosis, the chromosome number: a) is doubled b) is reduced c) remains the same d) becomes diploid 6. Meiosis produces haploid reproductive cells called. 7. Name the two human gametes & state their chromosome number. 8. How many times do cells divide during meiosis? 9. What are the stages of meiosis? List them in order. 10. What is a tetrad? 11. Which of the following best describe the term crossing over? a. An exchange of information between two homologous chromosomes b. A molecular interaction between two sister chromatids c. A molecular interaction between two non-sister chromatids d. A separation of two sister chromatids 12. What type of material is exchanged during crossing-over? 13. Crossing-over occurs in which stage of meiosis? a. Prophase I b. Prophase II c. Anaphase I d. Anaphase II 14. How many cells are formed at the end of Meiosis I & how many copies of chromosomes does each cell have? 15. Is DNA copied before Meiosis II? Yes No 16. How many cells have form at the end of Meiosis II and how many chromosomes do they contain?

3 Page 3 of 3 Chromosome # Organism Chromosome # Organism 78 Chickens 24 Rice 8 Fruit Fly 14 Pea 40 Beaver 48 Potato 36 Earthworm 216 Field Horsetail (plant) Use the above chart to help you answer the following questions 17. How many chromosomes does the egg you eat have? 18. How many chromosomes are in potato pollen? 19. How many chromosomes are in a beaver s tail? 20. A fruit fly short generation time (about 10 days at room temperature) combined with it s chromosomal number makes it a favorite of geneticist to study. What is a fruit fly s diploid chromosomal number? 21. How many chromosomes are in rice s somatic cells? 22. Which organism has 24 chromosomes in it s gametes? somatic cells Circle correct terms 23. A sperm cell is a (gamete, zygote), and is (haploid, diploid). 24. When a sperm cell and an ovum merge, they undergo the process of fertilization, and give rise to a (gamete, zygote), which is (haploid, diploid). A hypothetical organism has 10 chromosomes for each of its body cells. Cells are continuously being rubbed off and replaced. 25. How many chromosomes will be contained in each new skin cell that is replaced? 26. This replacement occurs through the process of. 27. The diploid number (2N) for this organism is 28. This organism would have how many homologous pairs of chromosomes? 29. The mature eggs of this female would contain how many chromosomes?

4 Page 4 of 3 Comparison Chart Meiosis Mitosis Definition Function Type of Reproduction Occurs in Genetically Crossing Over Pairing of Homologs Number of Divisions Number of Daughter Cells produced Chromosome Number Steps Karyokinesis Cytokinesis Centromeres Split Creates

5 Page 5 of 3 Use this Venn diagram to compare Mitosis and Meiosis.

6 Page 6 of 3 Meiosis Crossword (Stratton 2010) chiasmata chromatid crossover daughter cells diploid fertilization gamete chromosome tetrad genetic variation haploid homologous Word Bank chromosomes interphase meiosis oogenesis spermatogenesis ovum somatic cells sperm synapsis teleophase zygote Clues Across 5. production of eggs 6. a complete pair of chromosomes 2n 8. a fertilized egg 11. phase in which cytokinesis occurs 12. the results of cellular division 14. female gamete 15. the pairing of two homologous chromosomes during which crossovers can happen 18. basic body cell not sexual 21. chromosomes for the same traits Down 1. longest phase in meiosis 2. n the state of one half the chromosome number 3. sister chromatids 4. combining of egg and sperm 7. production of sperm 9. changes in chromosomes resulting from crossing over 10. two homologous pairs of chromosomes 13. crossing over of chromosomes 16. sexual reproduction 17. male gamete 19. when two chromosomes exchange information during synapsis 20. an egg or sperm 22. contains genetic material

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