Observing The Cell Cycle Biology Worksheet Page 8
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29E
Modeling meiosis
Meiosis is the process of producing sex cells with a haploid
set of chromosomes. Haploid means half the number of
chromosomes as the original cell. A haploid cell contains
one chromosome from each homologous pair.
1. Turn over your poster board and copy the chart
(right) onto the other side. Fill the entire space on
the board with your drawing.
2. Begin by assembling a diploid set of chromosomes
for the fruit fly as you did in part 1. Place the
chromosomes, in homologous pairs, in the first
nucleus on your chart.
3. Like mitosis, before meiosis begins, the
chromosomes double. Add a similar pipe cleaner to
each chromosome and attach with a piece of cereal
as you did in part 1.
4. Unlike mitosis which has only one cell division,
meiosis has two divisions (meiosis I and meiosis
II). Using the meiosis diagram in Chapter 10 of
your textbook as a guide, move your chromosomes
through meiosis I and meiosis II.
5. Fill in Table 3 below as you move your
chromosomes through the chart.
Table 3: Meiosis
Step
Number of
Number of
Number of
Diploid or
cells
chromosomes
homologous pairs
haploid
in each cell
in each cell
number?
Start of meiosis
End of meiosis I
End of meiosis II
4
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