Observing The Cell Cycle Biology Worksheet
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29Investigation 10A
Observing the Cell Cycle
10A Observing the Cell Cycle
How much time is spent in different stages of the cell cycle?
cell cycle
The life cycle of a cell is called the
.
Materials
Interphase is the period a cell spends growing
• Prepared onion root tip slides
Mitosis
and performing its functions.
is the part
• Prepared horse ascaris slides
of the cell cycle where the chromosomes are
• Textbook
divided into two new nuclei. Two daughter cells
• Pencil for sketching
are formed, each containing a complete set of
• Graph paper
chromosomes. Mitosis has 4 phases: prophase,
metaphase, anaphase, and telophase. After
mitosis, the cytoplasm and its contents divide,
separating the daughter cells (cytokinesis). In
this investigation, you will determine the
percentage of time a cell spends in interphase
and the four stages of mitosis.
A
Setting up
1. Set up a microscope and turn on the light.
2. On the stage, place a slide containing a stained preparation of Allium (onion root tip).
3. Locate the growth zone of the onion root tip. It is just above the root cap at the very
end.
4. Focus on low power, and then switch to medium or high power. Below are pictures of
the four stages of mitosis. Use them to help you identify the different stages on the
microscope slide.
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