Name: ___________________________Section: _______________ Date: _____________
ACTIVITY SHEET IN SCIENCE 7
Instruction: Study the stages of mitosis and answer the guide questions that follow.
Stages of Mitosis
Somatic cells or body cells divide by mitosis (nuclear division). Below is a series of
illustrations that will show the stages of mitosis. Study it and note the following structures to
describe the events: chromosome, nuclear membrane, the spindle fiber, and the cytoplasm.
STAGE EVENT
The chromosomes are replicated
and threadlike.
Interphase The nucleolus and the nuclear
envelope/membrane are visible.
spindle fiber
The nuclear membrane starts to
disappear. The chromosomes become
Prophase thick and shortens due to coiling. The
spindle forms outside the nuclear
envelope
sister . Chromosomes become thick, each
chromatids
with two chromatids, it attach to the
Metaphase spindle fiber and line up at the
middle.
The chromatids or each chromosome
separate and moves toward the
Anaphase opposite sides or poles.
cytoplasm The chromosomes are on the
opposite poles, the nuclear envelope
Telophase or nuclear membrane reforms or
begin to reappear. The cytoplasm
starts to divide
. The cytoplasm divides completely
Cytokinesis forming two new daughter cells. At
this stage the chromosomes of the
two daughter cells have the same
number as in the parent cell (diploid).
The chromosomes uncoil and appear
like a stretched thread.
1
GUIDE QUESTIONS
Prophase:
1.What happens to the cell’s nuclear membrane at prophase stage? Does the membrane start
to disappear or remain intact? _________________________
2. Can you see asters and spindle at the sides just outside the nuclear membrane? _______
3.Do the chromosomes seem to move to the opposite sides? _________________
Metaphase:
1.Can you still see the nuclear membrane? _________
2. Do you see chromosomes that attach to the spindle fibers? _______
3. In what part of the cell can you see the chromosomes? At the center or at the opposite
poles? _____________________
Anaphase:
1.Do you still see the chromosome attached to the spindle fiber? _____________
2. Do the chromosomes separate? __________________
3. In what direction do the separated chromosomes move? ________________________
Telophase:
1.Do you see nuclear membrane start to reappear? __________
2. What do you notice in the position of chromosome? Are they positioned in the
opposite sides? ______
3.Are the chromosomes equally distributed on opposite sides? ______
4. Aside from the appearance of the nuclear membrane, do you notice the
cytoplasm starting to divide or split? _______________________
Cytokinesis:
1.At this point, do you see the cell split into two daughter cells? ___________
2. Are the two new daughter cells equal in size and number of chromosomes? _________
3. Assuming that the number of chromosomes of the parent cell is four, do you expect that
the daughter cell would have the same number as the parent cell? _____________?
4.A human body cell has 46 chromosomes. How many chromosomes will each daughter cell
receive after completing mitosis? __________________________
5.. How many daughter cells are produced? ______________________
6. Do the daughter cells contain the same number of chromosomes as the parent cell?
________________________
7. Are the daughter cells identical or not? ___________________________
