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Across 2. n one chromosome at a time (ex. sperm and egg) 4. 2n characteristic chromosome 5. tangled mass of thin threads composing DNA and proteins 7. new plasma membrane expanding outward to merge with old cell membrane 9. indentation of the membrane between the two daughter nuclei 10. organizes spindle apparatus necessary for movement of cell chromosomes 12. division of the cytoplasm 13. barrel shaped organelles usually found in pairs and only in animal cells 14. kinetochore of each chromatid is attached to kinetochore spindle fibers 15. spindle disappears as new nuclear envelope form around daughter chromosomes 16. used to produce human tissue 17. shortest phase of mitosis; two sister chromatids of each duplicated chromosome separate at the centromere

Down 1. proteins that form on either side of the centromere 2. proteins involved in organizing chromosomes 3. centromeres of chromosomes are now in alignment on a single plane at the center of the cell 5. region in which sister chromatids are attached at 6. production of a new individual 8. future axis of cell division imaginary plane that is perpendicular and passes through cell 11. chromatin condenses and chromosomes become visible; nucleolus disappears