Across
- 4. a genetic marker that encodes an easily observable protein not normally present in an organism
- 5. genes that pattern the anterior-posterior body axis
- 9. the cells in the human blastocyst that ultimately give rise to the embryo
- 10. two sets of DNA in one person due to early fusion of fraternal twins
- 12. germ layer that gives rise to the lining of organs
- 14. type of immature reproductive cell that gives rise to haploid gametes when it divides
- 17. germ layer that gives rise to the epidermis and nervous system
- 18. protein that allows protons to bypass ATP synthase to generate heat
- 19. cells that migrate away from the neural tube and give rise to the peripheral nervous system
- 20. condition that results from failure of the neural rube to close
Down
- 1. the formation of sperm
- 2. stage when the embryo is a ball of cells with a cavity
- 3. germ layer that gives rise to the muscles, blood, and bones
- 6. the failure of homologous chromosomes to separate normally
- 7. formation of new blood vessels through branching of existing vessels
- 8. creation of a blood vessel
- 11. abnormal number of chromosomes
- 13. name for any diploid body cell
- 15. when some cells in the body carry a genetic mutation that isn’t present in other cells
- 16. the formation of egg cells