Across
- 4. external changes to DNA that turn genes "on" or "off"
- 5. shows intermediate stages of organisms with small changes occurring over time
- 6. cell division that produces gametes
- 8. contains a nucleus and membrane-bound structures
- 10. the process by which cells become specialized
- 11. only in animal cells, help in cell division
- 13. controls all functions of the cell
- 15. the scientific study of heredity
- 17. what an organism's chromosomes look like
- 18. converts sugar into energy for the cell
- 19. makes protein
- 20. when cancer cells spread to new parts of the body
Down
- 1. no nucleus or any other structure with a membrane around them
- 2. makes ribosomes
- 3. changes in organisms which are significant enough that, over time, the newer organisms would be considered an entirely new species
- 7. specific characteristics of an individual that are inherited
- 9. the delivery of characteristics from parent to offspring
- 12. when all organisms of a species have died
- 14. only in plant cells, converts light, carbon dioxide, and water into sugar
- 16. a permanent change in the nitrogen base sequence of a gene