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Cell Division

Cell Division. 7 th Grade Science Chapter 3 – Section 5. Cell Division and Growth. A single cell _______ and then _______, forming two new cells. A single cell grows and divides producing ____ new cells. Then the two cells grow and divide forming ____and so on.

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Cell Division

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  1. Cell Division 7th Grade Science Chapter 3 – Section 5

  2. Cell Division and Growth • A single cell _______ and then _______, forming two new cells. • A single cell grows and divides producing ____ new cells. • Then the two cells grow and divide forming ____and so on. • The process of cell growth and division is _________ and it happens in __________.

  3. Cell Division and the Cell Cycle __________ - sequence of growth and division – a cell grows, prepares for division, and divides into 2 new cells. • The two new cells are called _____________. • Each daughter cell begins the ___________ again. Three stages in the cell cycle: 1. _________ - cell grows 2. __________ - cell divides 3. __________ - two new cells are formed

  4. Stage 1. Interphase • During _________, the cell grows, makes a copy of its DNA, and prepares to divide into two new cells. • During the first part of interphase, the cell _______ to its full size and produces structures that it needs • The next part of interphase, the cell makes an exact copy of its _____ in its nucleus. This process is called ______________. • The cell prepares itself for _________

  5. Stage 2 - Mitosis • __________ - one copy of the DNA is distributed to each of the two new daughter cells. • There are four phases in the process of mitosis 1. ________ 2. _________ 3. _________ 4. __________

  6. Prophase, Metaphase, Anaphase • Prophase - Chromatin in the ________ condense to form ___________. The thread-like chromatin move to opposite sides of the nucleus. The _______________ breaks down. • Metaphase – The __________ line up across the center of the cell. • Anaphase – The chromosomes separate and each ________ becomes a new chromosome. The new chromosomes move to opposite ends of the cell. The cell stretches out – ends are pulled apart.

  7. Telophase • During _________ a new ____________ forms around each new group of chromosomes. Stage 3 – Cytokinesis ______________ - the cytoplasm divides and the organelles are distributed to each of the two new cells. Cytokinesis begins during _________.

  8. Cytokinesis • The __________ pinches into two new cells. • Each daughter cell gets about half of the ____________. • Each daughter cell has the same number of ____________as the parent cells • At the end of cytokinesis, ___________ begins again.

  9. Structure and Replication of DNA • ______________ - ensures that each daughter cell will have the genetic information it needs to carry out its activities. • Structure of DNA – twisted ladder, _________ • Each rung of the ladder is made up of _____________. There are four different bases - ____________, _____________, ____________, and ____________

  10. DNA Replication • _____________ begins when the two sides of the DNA strand ______and separate. The molecules of DNA separates between the two ___________________. • Nitrogen bases that are floating in the ________ pair up with bases on each half of the DNA molecule. • Adenine pairs with Thymine, Guanine pairs with cytosine.

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