Unit 4B

12345678910111213141516
Across
  1. 3. how cells reproduce
  2. 5. stage of early development in mammals that consists of a hollow ball of cells
  3. 9. An embryonic stage in animal development encompassing the formation of three layers: ectoderm, mesoderm, and endoderm.
  4. 11. repetitive DNA at the end of a eukaryotic chromosome
  5. 13. formation of organs
  6. 14. series of events in which a cell grows, prepares for division, and divides to form two daughter cells
  7. 16. one of two identical "sister" parts of a duplicated chromosome
Down
  1. 1. the process by which cancer spreads from one place to another
  2. 2. process in which cells become specialized in structure and function
  3. 4. structure in an animal cell that helps to organize cell division
  4. 6. DNA tightly coiled around histones
  5. 7. part of eukaryotic cell division during which the cell nucleus divides
  6. 8. Region of a chromosome where the two sister chromatids attach
  7. 10. unspecialized cell that can give rise to one or more types of specialized cells
  8. 12. sequence of DNA that codes for a protein and thus determines a trait
  9. 14. threadlike structure in the nucleus
  10. 15. disorder in which some of the body's cells lose the ability to control growth