Mitotic Cell Cycle

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Mitotic Cell Cycle
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Binary Fission
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Mitotic Cell Cycle
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Interphase

• DNA replicates during
  S period.

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Replication The difference between homologous
chromosomes and sister chromatids
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Phases of Mitosis
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Prophase

• Chromosomes coil, condense,
  shorten, and become visible.
• Spindle forms.

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Prometaphase

• Nuclear envelope
  disappears.
• Nucleolus disappears too.

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Metaphase

• The spindle microtubules
  align the chromosomes in
  the middle of the spindle.

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Anaphase

• The centromeres divide
  and the microtubules pull
  the chromatids apart
  toward opposite poles.

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Early Telophase

• The chromosome arrive at
  opposite poles, uncoil and
  elongate.
• Spindle disappears.

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Late Telophase

• Nuclear membrane forms
  around each set of
  chromosomes.
• Nucleolus reappears.

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The Resulting Daughter Cells

• Are genetically identical,
  each with the same
  chromosome number
  as the parent cell.

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Cytokinesis in Animal Cellsoccurs by actin
filaments pinching the cell in two
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Cytokinesis in Plant Cells a new cell wall is
laid down to divide the two daughter cells
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Question 1

• In mitosis, if a parent cell has 24 chromosomes,
  each daughter cell will have how many
  chromosomes?
• A. 48
• B. 72
• C. 12
• D. 24
• E. 6

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Question 2

• What happens during anaphase of mitosis?
• A. chromosomes condense.
• B. chromosomes align on the cell equator.
• C. chromosomes are pulled apart by spindle
  fibers.
• D. cells split in two.
• E. none of the above.

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Question 3

• Chromosomes are duplicated during which period?
• A. metaphase.
• B. G1 period.
• C. S period.
• D. anaphase.
• E. G2 period.

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Answers

• Question 1 D
• Question 2 C
• Question 3 C