CYTOLOGY

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Across
  1. 4. secreted human chorionic gonadotrophin
  2. 7. organ system that matures last
  3. 10. fraternal twins
  4. 11. a substance that causes birth defect is said to be
  5. 13. contains enzymes that aid sperm
  6. 14. the onset of breast development
  7. 16. pregnancy test kits detect this
  8. 17. a cell aggregate with 2 layers
  9. 20. produced by cancer cells
  10. 22. forms major connective tissue
  11. 23. primordial axial frame of fetus
  12. 25. killer enzyme
Down
  1. 1. programmed cell death
  2. 2. identical twins
  3. 3. from simple germ layer to distinct
  4. 5. stem cell capable of differentiating to other cell lineages
  5. 6. diploid egg cell
  6. 8. site of sperm cell maturation
  7. 9. appearance of pubic and axilla hair
  8. 12. oocyte + spermatocyte
  9. 15. crucial stage in pregnancy
  10. 18. bases at the end of chromosome, signals the ceasing of cell cycle
  11. 19. three-layered structure
  12. 21. somatic cell division
  13. 24. primarily secreted by endocrine glands