Mitosis Tutorial Virtual Lab

1. Which stage does the following occur?
Chromatin condenses into chromosomes: Prophase
Chromosomes align in center of cell: Metaphase
Longest part of the cell cycle: Anaphase
Nuclear envelope breaks down: Prophase
Cell is cleaved into two new daughter cells: Cytokinesis
Daughter chromosomes arrive at the poles: Telophase


Watch the video carefully.

2. The colored chromosomes represent chromatids. There are two of each color because one is an exact duplicate of the other.

--How many chromosomes are visible at the beginning of mitosis? None, because they are clumped as chromatin. However, when the chromosomes first become visible, the video shows 4.

-- How many are in each daughter cell at the end of mitosis? Again, you see none because they are clumped as chromatin, but the 4 chromosomes from the beginning would compose the chromatin.

--The little green T shaped things on the cell are: centrioles

-- What happens to the centrioles during mitosis? They grow spindle fibers to separate the chromosomes, and return to normal when their task is completed.

3 . Identify the stages of these cells:
Cell 1: Metaphase
Cell 2: Cytokinesis
Cell 3: Prophase

Another Mitosis Animation:
Go to www.johnkyrk.com/mitosis.html
View the animation and sketch the cell in:
Prophase
The centrioles grow spindle fibers and move to opposite ends of the cell. The chromatin condenses into chromosomes. The spindle fibers begin to reach out to the chromosomes. The nucleus dissolves.

Metaphase
The centrioles reach out another spindle fiber and attach one to each kinetochore (the area where the chromosomes are connected). They begin to pull apart.

Telophase
The nuclear envelope begins to form again. The chromatids disperse into chromatin. The spindle fibers dissolve and the centrioles shrink.

Onion Root Tip - Online Activity:
http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/cell_cycle.html
Read the introduction, then click the “next” button.

You will have 36 cells to classify. When you’re finished, record your data in the chart below.
Interphase:
Number of Cells-20
Percent of Cells-55.5555556
Prophase:
Number of Cells-10
Percent of Cells-27.7777778
Metaphase:
Number of Cells-3
Percent of Cells-8.33333333
Anaphase:
Number of Cells-2
Percent of Cells-5.55555556
Telophase-
Number of Cells-1
Percent of Cells-2.77777778
Total Number of Cells: 36
Total Percent of Cells: (calculate: number of cells divided by total cells x 100): 100 %

Mitosis in Whitefish & Onion Roots
http://www.biologycorner.com/flash/mitosis.html
For each organism, identify the stage of mitosis.
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View 1:
Whitefish-
Onion-
View 2
Whitefish-
Onion-
View 3
Whitefish-
Onion-
View 4
Whitefish-
Onion-
View 5
Whitefish-
Onion-