Biology 132 Exam 4 Terminology Review

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