Meiosis Internet Investigation
Name _________________________
Date _______________ Per. _____
Start here:
https://lpscience.fatcow.com/jwanamaker/animations/mitosis.html
1. Mitosis is cell division that produces __________ cells.
2. How many chromosome pairs does the parent cell have? _______________ How many total
chromosomes? __________
3. How many pairs of chromosomes do the daughter cells have? ___________ How many total
chromosomes? __________
https://lpscience.fatcow.com/jwanamaker/animations/meiosis.html
1. Meiosis is cell division used to produce __________ and __________ cells.
2. The “parent” cell that will undergo meiosis is shown to have chromosome pairs.
How many chromosomes does the cell have? _____ How many chromosome pairs? _____
3. True or False? After the chromosomes (DNA) have replicated, the cell is now said to have 12
chromosomes.
4. What is the name for the area where two identical DNA molecules (chromatids) are held together?
Hint: it’s shown as a black dot and is labeled in the diagram. _______________________________
5. At the beginning of meiosis, chromosomes find their partners and crossing-over can happen. Based on the
animation, what do you think “crossing-over” means?
6. After the chromosomes separate, how many chromosomes end up at each “pole” of the cell? _____
7. Since there are no chromosome pairs in each of the daughter cells formed, the daughter cells are
_______________ (diploid or haploid?). The website doesn’t give you this answer! You have to think.
8. Follow what happens in the animation. After the one cell has divided to form two, summarize what
happens in the next few phases.
9. How many daughter cells are there at the end of meiosis? _____
10. Each daughter cell has _____ chromosomes in its nucleus. How does this compare to the original number
of chromosomes in the “parent” cell? Hint: compare to question #2.
Navigate to http://www.pbs.org/wgbh/nova/baby/divi_flash.html
1. How do the daughter cells produced by mitosis compare to one another?
2. How many chromosomes would be found in a fertilized human egg if meiosis did not reduce the number of
chromosomes in the gamete cells? _______
● Click “next” to advance to slide #2. Preview the questions below so you can answer them as you
advance through the slides.
3. True or False? DNA replicates before both Mitosis and Meiosis.
4. Describe how Prophase I differs from prophase of Mitosis.
5. Describe the difference between Metaphase I and Metaphase of Mitosis.
6. a) Sister chromatids are shown to be separating in _______________________ (Mitosis or Meiosis?) in this
slide of Anaphase.
7. The cell that has completed Mitosis in the animation now contains ______ chromosomes in each daughter
cell. This is _________________ (the same or half?) the number originally present.
8. The cell that has completed Meiosis I in the animation now contains ______ chromosomes in each
daughter cell. This is _________________ (the same or half?) the number originally present.
9. What happens to some of the cells produced by Meiosis I in females and why does this occur?
10. _________________________ (Homologous chromosomes or Sister chromatids?) separate during
Anaphase II.
Navigate to
http://highered.mcgraw-hill.com/sites/0072437316/student_view0/chapter12/animations.html
o Click on “Unique features of Meiosis”.
1. List the 3 unique features of Meiosis (not found in Mitosis):
●
●
● .
Keep going!
http://www.aboutkidshealth.ca/En/HowTheBodyWorks/GeneticsIntroduction/CellDivision/Pages/default.a
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1. List the locations in the body where Mitosis occurs and the locations where Meiosis occurs.
2.
3.
4.
5.
● On the menu on the left side, click “Mitosis: Introduction”.
Describe what Mitosis is used for in the body.
● On the menu on the left side, click “stages of Mitosis” to advance to the picture of the cell undergoing
Mitosis. “Slide” the button shown below the picture towards the right to advance through the phases
of mitosis.
What structures form between the centrioles (centrosomes) during prophase? ____________________
A total of _____ chromosomes are shown in the illustrated parent cell. The daughter cells that are
produced each have _____ chromosomes.
● On the menu on the left side, click “Meiosis: Introduction” to move on to the information about
meiosis.
In the picture of the karyotype of the parent cell before meiosis one chromosome in each pair is pink, while
the other is blue. What is this color variation meant to represent? Use the key to help you.
6. In the daughter cell pictures, some chromosomes have both blue and pink portions (i.e. the whole
chromosome is not a single color). Name the process that causes this to occur.
● On the menu on the left side, click “stages of meiosis I”. “Slide” the button shown below the picture
towards the right to advance through the phases of meiosis I.
7. A total of _____ chromosomes are shown in the illustrated parent cell. The two cells that are produced by
meiosis I each have _____ chromosomes, which means that they are _____________________ (haploid
or diploid?).
● On the menu on the left side, click “stages of meiosis II”. “Slide” the button shown below the picture
towards the right to advance through meiosis II.
8. A total of _____ chromosomes are shown in the illustrated cells at prophase II.
9. True or False? The chromosome number of a cell is reduced by ½ during meiosis II.
BONUS QUESTIONS:
On the menu on the left side, click “Sperm formation: Spermatogenesis” to move on.
B1. _________________________ is the process that produces sperm. Of the 4 sperm cells produced by
meiosis, ____ will go on to develop into mature sperm. The immature sperm cell is called a
_________________. This process occurs in males, beginning at _______________.
On the menu on the left side, click “Egg formation: Oogenesis” to move on.
B2. _______________________ is the process that produces eggs. Of the 4 possible daughter cells produced
by meiosis, only _____ actually becomes an egg cell. The cells that do not become eggs are called
_______________________. This process occurs in females, beginning at ___________________.