On the left side of the screen is a navigation bar, click on the link to “MITOSIS” Read the text on this page and view the animation, you can slow down the video by clicking step by step through the phases.


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? 92

-- How many are in each daughter cell at the end of mitosis? 46

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

-- What happens to the centrioles during mitosis? they go to the poles and connect all the spindle fibers to the chromosomes.

3 . Identify the stages of these cells:
Metaphase
Anaphase
Interphase

Another Mitosis Animation

Go to www.johnkyrk.com/mitosis.html

View the animation and sketch the cell in:
Prophase

nucleolus disappears then the centrioles go to the poles. after that, long green fibers called spindle fibers spread to the chromosomes.



Metaphase

the spindle fibers disconnect the the sister chromosomes at the centromere, then take the chromosomes to the centrioles.


Telophase

While the spindle fibers dissolve, two nuclei form at both sides. Then, the cells finally disconnect, and a new membrane forms.

Number, % of Cells:

Interphase: 20, 56%
Prophase: 10, 28%
Metaphase: 3, 8%
Anaphase: 2, 6%
Telophase: 1, 3%

Whitefish

View 1: Telophase
View 2: Metaphase
View 3: Interphase
View 4: Anaphase
View 5:

Onion

View 1: Anaphase
View 2: Metaphase
View 3: Prophase
View 4: Interphase
View 5: Anaphase