Across 2. n one chromosome at a time (ex. sperm and egg) 6. kinetochore of each chromatid is attached to kinetochore spindle fibers 10. organizes spindle apparatus necessary for movement of cell chromosomes 15. used to produce human tissue 16. future axis of cell division imaginary plane that is perpendicular and passes through cell 17. chromatin condenses and chromosomes become visible; nucleolus disappears 18. proteins that form on either side of the centromere 19. proteins involved in organizing chromosomes

Down 1. centromeres of chromosomes are now in alignment on a single plane at the center of the cell 3. shortest phase of mitosis; two sister chromatids of each duplicated chromosome separate at the centromere 4. tangled mass of thin threads composing DNA and proteins 5. production of a new individual 7. 2n characteristic chromosome 8. division of the cytoplasm 9. region in which sister chromatids are attached at 11. new plasma membrane expanding outward to merge with old cell membrane 12. indentation of the membrane between the two daughter nuclei 13. barrel shaped organelles usually found in pairs and only in animal cells 14. spindle disappears as new nuclear envelope form around daughter chromosomes