Cell Division in the Onion Root Tip. RS: Ms. Alvarez CT: Mrs. Rojas. Adapted from M. Arias. The Cell Cycle. Cells grow and divide. As one cell enters Mitosis, two cells exit which are exact replicas or clones of the original “parent” cell.
RS: Ms. Alvarez
CT: Mrs. Rojas
Adapted from M. Arias
Purpose: to replenish dead or dying cells, to allow an organism to grow and develop
Onion root tip
What happens when you cut your finger?
The cells bordering the injury will begin dividing to fill in the gap in the tissues that have been torn or broken. This is the process known as wound healing.
When you examine a cross section of a root
tip, you will see lots of cells at different growth
Goals:Today’s activity will help you understand the phases of the cell cycle and determine what happens when Mitosis is disrupted.
Hypothesis:If the cells located in the onion root tip are frequently dividing, then we should be able to _________________.
• Onions root tips
• Toluidine blue or aceto-orcein
• 1M hydrochloric acid
• Razor blades
• Safety goggles
• paper towel
**Wear proper safety equipment, including goggles and gloves, for the next steps.