Mitosis and Meiosis
For organisms to grow and reproduce, cells must divide. Mitosis and meiosis are both
processes of cell division, but their outcomes are very different.
Key Concepts I: Mitosis
DIRECTIONS: On a separate piece of
loose leaf, define these vocabulary
words by clicking on the blue words on
your computer screen:
Mitosis
Daughter cells
Diploid
Haploid
Meiosis
Cytoplasm
interphone
Karyokinesis
Cytokinesis
genome
homologous
alleles
Synapsis
crossing over
Draw & label the “Cell Cycle” found on your screen here:
Read the following sections to prepare for the quiz at the end of this web-quest:




Nuclear Division (Karyokinesis)
Interphase
Cytoplasmic Division (Cytokinesis)
Homologous Chromosomes
Identifying the Phases of Mitosis
Identify each
phase of mitosis
in the picture 
DIRECTIONS: Draw & label each phase of mitosis below, as it appears on your computer screen:
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
Observing Mitosis in a Living Cell:
Describe your observations and thoughts about the video clip on this page.
Analysis of Results I:
We’ll practice with the slide of onion root cells (below). Looking at the cells marked with an X,
1) Count the number of
cells in ALL THE CELLS
IN MITOSIS and fill-in
the chart below
2) Count the number of
cells in EACH phase
(Pro, Meta, Ana And
Telo) and fill-in the chart
below
3) NEXT calculate the time
for each stage:
FACT: The average time for onion root
tip cells to complete the cell cycle is 24
hours (that is equal to 1440 minutes)
FORMULA: % of cells in the stage X 1440 minutes = number of minutes in that stage
Calculate the time for each stage by filling-in the table below; then check your answers on the screen.
A
B
C
D
E
(formula b/c*100)
PHASE:
Total Cells
Counted
Counted in
this phase
Percent in
each phase
F
(formula d*e))
Multiply by
X 1440
# minutes in
this phase
Interphase:
X 1440
Prophase:
X 1440
Metaphase:
X 1440
Anaphase:
X 1440
Telophase:
X 1440
Totals for each
column here 
Lab Quiz I
1. Select the phase of the cell cycle depicted in the image below.
ANS: _______________
2. Select the phase of the cell cycle depicted in the image below.
ANS: _______________
3. Select the phase of the cell cycle depicted in the image below.
ANS: _______________
4. Select the phase of the cell cycle depicted in the image below.
ANS: _______________
Key Concepts II: Meiosis
DIRECTIONS: Draw & label each phase of mitosis below, as it appears on your computer screen:\
Interphase I
Prophase I
Metaphase I
Anaphase I
Telophase I
Cytokinesis I
Prophase II
Metaphase II
Anaphase II
Telophase II
Cytokinesis II
Crossing Over
Draw & label each phase of crossing over on your computer screen:
Synapsis:
Crossing Over:
Final: