Student- directed Cell Division Review:
The following review is designed to refresh your memory of the
ninth grade concepts of Mitosis and Meiosis.
It is important that you revitalize your comfort with these processes
and are able to speak intelligently about them.
You may pull out your freshman journal and go over those notes
again.
I will not spend time in class describing each event and reteaching
structures. So pay special attention to the vocabulary and have it
memorized so that you may easily use it in appropriate ways.
You will want to go through these to prepare for class…we WILL
NOT DO A TRADITIONAL GO THROUGH OF THE STAGES
OF MITOSIS OR MEIOSIS IN CLASS, YOU ARE EXPECTED
TO KNOW THEM…
• Mitosis animation
http://www.sumanasinc.com/webcontent/anisamples/majors
biology/mitosis.html
• Comparison of mitosis and meiosis animation…good
tutorial…go do this!
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
• Meiosis step by step you should go do this one…
http://www.lewport.wnyric.org/jwanamaker/animations/meiosi
s.html
http://www.sumanasinc.com/webcontent/anisamples/majors
biology/meiosis.html
• Extensive meiosis animation, tutorial
http://www.pbs.org/wgbh/nova/cancer/grow_flash.html
http://www.dnalc.org/stemcells.html
Reviewing Mitosis
PRINT THIS OUT TO TURN IN ON DUE DATE.
Complete the following tutorial on mitosis by typing your answers below. Please use italics for
all answers. Go to:
www.biology.arizona.edu
Click on Cell Biology
Click on The Cell Cycle and Mitosis
1.
What proteins are closely associated with DNA?
In what way are they associated with each other?
2.
Describe the difference between chromatin and chromosomes.
3.
What, specifically, is a “nucleosome”?
4.
What two molecules make up the “backbone” of DNA (the sides of the ladder)?
5.
Name the four nitrogenous bases of DNA:
6.
DNA contains the information necessary to code for specific ________.
7.
Using this site (http://biology.about.com/library/weekly/aa071300a.htm) describe the
events taking place in each of the following:
a. G1
b. S
c. G2
8.
Explain clearly the difference in mitosis and the cell cycle:
9.
What is the term for “nuclear division”?
10.
What is the term for “cytoplasmic division”?
11.
The end result of mitosis is _____________daughter cells, each with
_________________________________________ as the parent cell.
12.
Mitosis occurs in the somatic cells. What are somatic cells?
http://www.wordiq.com/
13.
Define:

Diploid

Haploid
For each of the stages of mitosis, draw a CLEAR picture of what is taking place (we will
add to these diagrams later) and describe each event that is taking place at each
stage…Use different colors for maternal and paternal chromosomes and have 4
chromosomes, two from each parent.
Interphase
Diploid or
Events:
Haploid?
Prophase
Events:
__________
Metaphase
Events:
__________
Anaphase
Telophase:
Events:
__________
LABEL THE DIAGRAM OF A METAPHASE CELL BELOW…
• Label: Aster, spindle apparatus, spindle fibers, MTOC, centrosomes, non/kinetochore microtubules, sister chromatids, centromere, kinetochores,
chromosome, centrioles, equator, poles
Meiosis and Sexual Reproduction…
Using the URL given, complete the following outline and questions:
http://www.sumanasinc.com/webcontent/anisamples/majorsbiology/meiosis.html
What is synapsis?
When does it occur?
What are chiasmata?
When do they form?
What phenomenon results from the formation of chiasmata?
When do chromosomes replicate during meiosis?
During metaphase I what exactly lines up on the metaphase plate?
Could cells produced at the end of meiosis I ever be identical? Explain!!
What lines up on the equator during meiosis II?
Could the cells at the end of meiosis II ever be identical? Any of them? Explain!!
Why is meiosis I called the “reduction division”?
During which meiosis (I or II) does the chromosome number go from diploid to haploid?
What is the trick for telling?
Identify three sources of variation that result from meiosis and sexual reproduction:
a.
b.
c.
Sister chromatids are supposed to be genetically identical. Give two sources of
variation in sister chromatids:
What process restores the haploid chromosome number of germ line cells to diploid?
Explain independent assortment:
How many possible ways can our chromosomes sort during meiosis I?
THE STAGES OF MEIOSIS:
The parental cell is a fruit fly spermatogonium (2n=4). Draw the cells in each phase of
meiosis, keeping maternal and paternal chromosomes differentiated by color!
DISTINGUISHING EVENTS
Name the cells and identify as diploid or haploid
PROPHASE I
METAPHASE I
ANAPHASE I
TELOPHASE I
CYTOKINESIS
Meiosis I is considered the _________________ division because the cells go
from ____________ to _______________ during this process.
Notice, there is no ________________ between meiosis I and meiosis II.
Therefore, the DNA is NOT ___________________.
PROPHASE II
METAPHASE II
ANAPHASE II
TELOPHASE II
CYTOKINESIS
At the end of Meiosis II, _________ sperm cells are formed, but only __________
egg cell is formed. Go back and identify the steps at which egg cells are lost.
At the end of meiosis, the _____________parental cell has become ____________
daughter cells.
This allows for the organism’s original ____________ number to be restored by
the process of _______________ during sexual reproduction.
PRINT THIS OUT FOR TURN IN ON DUE DATE!! JAN. 5, 2015