Across
- 3. chemical released by one organism that effects another
- 7. amniotic fluid-filled sac that surrounds the embryo
- 9. hollow ball of cells
- 11. the formation of organs
- 14. the cleavage cannot pass through the yolk
- 15. parent separates into two equal organisms
Down
- 1. when blastula folds in on itself to form three layers
- 2. individual with male and female reproductive systems
- 4. the release of mature eggs at the midpoint of each cycle
- 5. early steps in the formation of the brain and the spinal cord
- 6. provides nutrition for the embryo
- 8. outgrowth of existing organism becomes a new organism
- 10. production of gametes
- 12. the cleavage passes through the yolk
- 13. the outermost membrane of the embryo (the placenta)