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Question
Both unicellular and multicellular organisms undergo mitosis. What are the differences, if any, observed in the process between the two?
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Solution
Criteria
Unicellular organisms
Multicellular organisms
DNA replication
DNA replication and nuclear division occurs almost simultaneously.
DNA replication occurs in the S phase after which nuclear division occurs in mitotic phase.
Formation of spindle apparatus
Usually absent (as in prokaryotes).
Present.
Purpose
A mode of reproduction.
A means of tissue repair or growth of the organism.
| Criteria | Unicellular organisms | Multicellular organisms |
| DNA replication | DNA replication and nuclear division occurs almost simultaneously. |
DNA replication occurs in the S phase after which nuclear division occurs in mitotic phase. |
| Formation of spindle apparatus | Usually absent (as in prokaryotes). | Present. |
| Purpose | A mode of reproduction. | A means of tissue repair or growth of the organism. |
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