Biology 10 Name ______________________________
MITOSIS AND MEIOSIS
With sock “chromosomes”
The purpose of this exercise is to become familiar with the behavior of chromosomes
during two types of cell division, mitosis and meiosis. The chromosomes you will work
with are represented by socks. You should be able to follow the fate of chromosomes
from your parent cell into your daughter cells for both types of cell division. You should
also review the other changes occurring in your cell(s) as the chromosomes move about.
Bag of sock “chromosomes” (4 pair)
Rubber band “centromeres” (4)
Exercise: You should work in groups of four. Each group has a diploid cell with four
“chromosomes” (socks). Each member of the group should show the movement and
ultimate fate of the sock chromosomes in mitosis and meiosis to the rest of the group.
Start with a single member of each of your four pairs; these represent your four
chromosomes during interphase before chromosome duplication (S phase). Answer the
questions below. You should discuss them together as a group. If your group cannot
come up with an answer that you all agree is right, see me.
1. Identify your group’s chromosomes by describing your socks (for example: 1 pink
lace, 1 green lace, 1 blue stripe, 1 red stripe). ___________________________________
2. What is the diploid number of chromosomes/socks? __________
What is the haploid number of chromosomes/socks? __________
3. Sexually reproducing organisms get one member of each pair of chromosomes from
each parent. How many socks did your creature get from its mother? ___________
How many from its father? ___________
4. How many homologous pairs of chromosomes does your cell contain? _________
Describe each member of one of the homologous pairs of chromosomes in your cell:
On what basis did you pick these two socks to be members of a homologous pair?
5. Pick any chromosome to have come from the father and describe it here:
_______________________________. Given that the sock you picked came from the
father, which sock do you know for sure came from the mother? ___________________.
How do you know this? ____________________________________________________
6. The creature from which your cell came has had an injury and needs to replace
damaged skin cells. What type of cell division (meiosis or mitosis) will generate new
skin cells? ____________________
7. This creature has reached maturity and is ready to make gametes within its
reproductive organs. What type of cell division (meiosis or mitosis) will produce these
Now—your chromosomes are going to be duplicated (in S phase during interphase). To
show this, take both socks of a pair of socks and link them together with “centromere”
8. What does each sock in the rubber-banded pairs represent? _____________________
Your chromosomes are now ready to go through mitosis or meiosis. Follow the
chromosomes through both mitosis and meiosis. After doing this, describe the
chromosomes/socks you ended up with in daughter cells by filling out the table:
How many daughter cells
(from single cell)?
How many chromosome/
socks in a daughter cell?
Sock combinations possible
in daughter cells (describe)
(e.g. 1 pink lace +
1 blue stripe, etc.)