Chapter 9 BIO 103
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Chapter 9 BIO 103
Chapter 9 Biology 103
What is the purposes of Cell Division?
-Growth and repair
-maintains surface area to volume ration
-allows for specailization
What does Binary Fission do in prokaryotes?
-Replication of chromosomes
-Elongation of the cell
-Separation of the chromosomes
-In growth of the plasma membrane
-Formation of the cell wall and separation
What is the difference between chromatin and chromosomes?
Chromatin-thin threads and is found in a nondividing cell
Chromosomes-the are coiled and condensed and are found in dividing cell
Charistic number of chromosomes-
each species has this
full compliment of chromosomes, found in somatic body cells, 2N
Half diploid number, only sex cells, N
Replication of DNA-
occurs prior to cell division
the two identical members of a replicated chromosome
constriction where sister chromatids are held together
barrel shaped organelles found in animal cells
Microtuble organizing center
Stages of cell cycle-
Repeating steps of cell growth and division
1st growth phase-organelles increase in number and the cell grows
2nd growth phase- manufacture of proteins and enzymes needed for cell division
division of the nucleus
division of the cytoplasm
Chracteristics of Cancer cells-
have abnormal nuclei
do not undergo apoptosis- cell death
undergo metastasis-spread, new blood vessels
-Nuclear division in which chromosome number stays the same.
daughter cells, each with the
number of chromosomes
-Each daughter cell receives the
kind of chromosomes as were present in the mother cell
DNA already replicated.
-Nuclear envelope breaks down
-Chromosomes condense with no oriantation
-spindle apparatus begins to form
-Chromosomes align at the metaphase plate
-Spindle apparatus is full formed and attached to the chromosomes at the centromere
-Centromeres divide, chromatids separate, chromosomes move to the poles
-Cytokinesis begins with a cleavage furror
-Nuclear envelope reforms
-Spindle Apparatus breaks down
same as animal cells but instead of a cleavage furrow, vesicles from the Golgi apparatus form a cell plate, becomes a plasma membrane into cell wall
Division of cytoplasm and organelles is_______.
Mitosis results in ___ daughter cells with the ______ diploid number of chromosomes; they are genetically__________.
2. diploid. identical.