CELLULAR DIVISION

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CELLULAR DIVISION
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CELLULAR DIVISION

• 1. The Cell Cycle the repeated growth and
  division of a cell

(Growth)
(Preparation for Division)
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CELLULAR DIVISION

• 2. Interphase the first stage of the cell cycle
  (there are 3 parts)

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CELLULAR DIVISION

• A. Growth cell grows to reach mature size
  (doubles) mitochondria and chloroplasts copy
  E.R. increases in size

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CELLULAR DIVISION

• B. DNA Replication DNA is copied in
  preparation for cell division the cell now
  contains 46 pairs of chromosomes (92) chromosomes

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CELLULAR DIVISION

• C. Preparation for Division the cell checks
  for errors if errors are not corrected, the
  cell may self-destruct

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CELLULAR DIVISION

• 3. Mitosis cellular division (there are 4
  phases)

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CELLULAR DIVISION

• A. Prophase nuclear membrane breaks down and
  chromatin condenses to form chromosomes
  spindle fibers appear

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CELLULAR DIVISION

• B. Metaphase chromosomes line up along the
  center of the cell nucleus is not present
  spindle fibers stretch across the center of the
  cell (92 chromosomes)

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• C. Anaphase chromosomes split at their
  centromeres chromatids move to opposite ends of
  the cell (92 chromosomes)

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CELLULAR DIVISION

• D. Telophase the cell is about to split
  apart two new nuclei appear with nuclear
  membranes (92 chromosomes)

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CELLULAR DIVISION

• 4. Cytokinesis the cell membrane pinches and
  eventually the cell pinches in two each cell now
  contains 46 chromosomes

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CELLULAR DIVISION
INTERPHASE IN AN ONION ROOT CELL
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CELLULAR DIVISION
PROPHASE IN AN ONION ROOT CELL
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CELLULAR DIVISION
METAPHASE IN AN ONION ROOT CELL
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CELLULAR DIVISION
ANAPHASE IN AN ONION ROOT CELL
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CELLULAR DIVISION
TELOPHASE IN AN ONION ROOT CELL
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CELLULAR DIVISION
CYTOKINESIS IN AN ONION ROOT CELL
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CELLULAR DIVISION