Across 1. tangled mass of thin threads composing DNA and proteins 4. kinetochore of each chromatid is attached to kinetochore spindle fibers 7. centromeres of chromosomes are now in alignment on a single plane at the center of the cell 11. used to produce human tissue 15. proteins that form on either side of the centromere 17. proteins involved in organizing chromosomes 18. organizes spindle apparatus necessary for movement of cell chromosomes 19. spindle disappears as new nuclear envelope form around daughter chromosomes

Down 2. production of a new individual 3. indentation of the membrane between the two daughter nuclei 5. 2n characteristic chromosome 6. chromatin condenses and chromosomes become visible; nucleolus disappears 8. division of the cytoplasm 9. future axis of cell division imaginary plane that is perpendicular and passes through cell 10. new plasma membrane expanding outward to merge with old cell membrane 12. barrel shaped organelles usually found in pairs and only in animal cells 13. region in which sister chromatids are attached at 14. shortest phase of mitosis; two sister chromatids of each duplicated chromosome separate at the centromere 16. n one chromosome at a time (ex. sperm and egg)