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2/10 Mitosis Onion Root Lab

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by

Leah Clement

on 18 March 2015

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Transcript of 2/10 Mitosis Onion Root Lab

Smart Start
You have 5 minutes to quietly complete the following your on Smart Start sheet.
1. List the 4 phases of mitosis. Use your flipbook from yesterday to help you if needed!
2.Draw a picture of a cell with 4 chromosomes in METAPHASE. Label the spindle fibers, the centrioles, the chromosomes and the centromeres
Objectives
Students will IDENTIFY the stages of mitosis in onion root tip cells and COLLECT data to determine the relative lengths of each stage of the process
Objective: Students will IDENTIFY the stages of mitosis in onion root tip cells and COLLECT data to determine the relative lengths of each stage of the process
Mitosis
Lab: Onion
root tip

UNIT 5: Genetics
INTRODUCTION: In this activity, you and your elbow partner will be viewing mitosis in onion root tips. You will also apply an analytic to determine the relative length of each stage of mitosis. While making your observations, consider the relative number of cells actually involved in mitosis Cells that are actively dividing but not yet in mitosis are said to be in interphase, during which time the DNA is copied and the cell is otherwise preparing for replication. Some root cells have ceased dividing and are only increasing in size, whereas others have reached their final, mature size and function, and are said to be in the Go stage.


1.Scan your image, look for the region that has large nuclei relative to the size of the cell; among these cells will be found cells displaying stages of mitosis. Draw an example of each stage
2.Systematically scan the root tip moving upward and downward through a column of cells.
3.Tally each cell in a stage of mitosis that you observe, being careful not to record the same cell twice. Tally the stages of 20 mitotic cells.
4.Tally numbers in the table below. Each group member should tally cells from a different image.
DIRECTIONS: You will be given 2 images showing the cells of an onion root tip. You and your partner will alternate roles as observer and tallier.
Model
MODEL: Calculating % of cells in that phase
EXAMPLE: PROPHASE class total = 27
TOTAL class total = 100

% of cell in that phase = 27%
Class Data
REVISITING OBJECTIVE:
Students will IDENTIFY the stages of mitosis in onion root tip cells and COLLECT data to determine the relative lengths of each stage of the process
Exit Ticket
DIRECTIONS: Complete the following questions on a spare sheet of paper. Drop your ticket at the desk near the front door on your way out
1. What are the 4 stages of the mitosis?

2. How do real cells compare to the models we been making of cells undergoing mitosis?
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