Name________________________________________________
Unit 2 Lesson 1 Mitosis
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Cell division takes place for different reasons.
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Cell division is important for __________________________________, which involves only one
parent organism.
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Most ___________________ in a multicellular organism happens because cell division produces
new cells.
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Cell division also produces cells for _______________________.
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The genetic material in cells is called DNA (deoxyribonucleic acid).
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In eukaryotic cells, DNA is found in the ______________________________.
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A DNA molecule contains the information that determines the ___________________ that a
living thing inherits and needs to live.
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During most of a cell’s life cycle, DNA is found in a mass of loose strands called
_______________________________.
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Before cell division, DNA is ______________________________.
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As cell division begins, the chromatin is compacted into visible structures called
_____________________________.
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A duplicated chromosome is made of two identical structures called ______________________.
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The life cycle of a eukaryotic cell, called the cell cycle, can be divided into three stages:
________________________, _____________________, and ___________________________.
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____________________________ is the stage in the cell cycle during which the cell is not
dividing.
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The cell grows to about twice the size it was when it was first produced. It produces various
organelles and engages in normal life activities.
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Changes that occur during interphase prepare a cell for division.
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In eukaryotic cells, ___________________________ is the part of the cell cycle during which the
nucleus divides.
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_____________________________ do not undergo mitosis because they do not have a nucleus.
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Mitosis results in two nuclei that are ________________________ to the original nucleus.
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When mitosis is complete, the cell has two identical sets of chromosomes in two separate
nuclei.
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___________________________ is the division of the parent cell’s cytoplasm.
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Cytokinesis starts during the last step of mitosis and eventually forms two complete cells.
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In cells that have a cell wall, a ______________________ forms during cytokinesis. The
__________________________ separates the cell into two new cells.
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There are four phases of mitosis: _________________________, _______________________,
___________________________, and _______________________________.
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By the end of the four phases, the cell will have two identical nuclei.
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In _________________________, the chromatin in the nucleus condenses into chromosomes.
The membrane around the nucleus breaks down.
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In ___________________________, the chromosomes line up in the middle of the cell.
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In __________________________, the chromatids of each chromosome are pulled to opposite
sides of the cell.
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In ____________________________, a new nuclear membrane forms around each group of
chromosomes, which become less condensed.
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Cytokinesis begins during this phase
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After mitosis, cytokinesis results in two new cells, and the two new cells start the cell cycle
again.