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Across 3. Zygote is the fusion of sperm and egg by ....... 5. division of cytoplasm 9. chromosomes are moving to opposite poles 12. 21 trisomy 14. DNA molecules ...............during 'S' pahse of interphase 17. chromosomes are arranged in the middle plane 19. .................. fibers are assembled during prophase 20. cancer cells travel to all parts of body 21. sex chromosomes in human female 23. types of proteins present in chromosomes

Down 1. humans have 22 pairs of ................ 2. exchange of genetic materials during meiosis 4. nuclear membrane, nucleolus disappear during ..... 6. one of the major reasons for cancer is ........... 7. display of chromosomes arranged by size, shape 8. four haploid cells produced by ................division 10. area where chromatids are held together 11. longest stage of cell division 13. two sets (half number from father and half from mother) of chromosomes in a cell 15. ..................just reverse to prophase 16. one set of chromosomes in a cell 18. English letters used to remember mitotic stages 19. XX & XY chromosomes are ..............chromosomes 22. sex chromosomes in human male