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