Aice Biology Nuclear Division
11/9/2011
AICE Biology
Ch 6 Jones; Ch 10 Raven
Content • Replication and division of nuclei and cells • Understanding of chromosome behavior in mitosis Learning Outcomes Candidates should be able to: (a) explain the importance of mitosis in the production of genetically identical cells, growth, repair and asexual reproduction; (b) [PA] describe, with the aid of diagrams, the behavior of ( )[ ] chromosomes during the mitotic cell cycle and the associated behavior of the nuclear envelope, cell membrane, centrioles and spindle (names of the main stages are expected); (c) explain how uncontrolled cell division can result in cancer and identify factors that can increase the chances of cancerous growth; (d) explain the meanings of the terms haploid and diploid and the need for a reduction division (meiosis) prior to fertilization in sexual reproduction; (e) use the knowledge gained in this section in new situations or to solve related problems.
Multicellular organisms begin as a single cell
Mitosis Cell division Also used in repair Asexual reproduction p
Cell Size
Bacteria E. Coli doubles every 30 minutes Heart & nervous system cells rarely divide, if at all Skin cells and digestive tract cells divide throughout life Some every 6 hours Grow to a certain size and stop Controls are turned on and off During injury, cells are stimulated and rapidly divide and grow – produces new cells, .i.e. healing After healing, cell growth slows and returns to normal Uncontrolled cell growth results in cancer
Surface Area (length x width x 6) Volume (length x width x height) Ratio of Surface Area to Volume
Surface area and volume do not increase at the same rate Larger cells have difficulty exchanging oxygen and waste in
and out of the cell Before cell becomes too large it undergoes cellular division and forms 2 daughter cells
1
11/9/2011
Cell Cycle includes G1 phase
Two G phases and S phase make
AICE Biology
Ch 6 Jones; Ch 10 Raven
Content • Replication and division of nuclei and cells • Understanding of chromosome behavior in mitosis Learning Outcomes Candidates should be able to: (a) explain the importance of mitosis in the production of genetically identical cells, growth, repair and asexual reproduction; (b) [PA] describe, with the aid of diagrams, the behavior of ( )[ ] chromosomes during the mitotic cell cycle and the associated behavior of the nuclear envelope, cell membrane, centrioles and spindle (names of the main stages are expected); (c) explain how uncontrolled cell division can result in cancer and identify factors that can increase the chances of cancerous growth; (d) explain the meanings of the terms haploid and diploid and the need for a reduction division (meiosis) prior to fertilization in sexual reproduction; (e) use the knowledge gained in this section in new situations or to solve related problems.
Multicellular organisms begin as a single cell
Mitosis Cell division Also used in repair Asexual reproduction p
Cell Size
Bacteria E. Coli doubles every 30 minutes Heart & nervous system cells rarely divide, if at all Skin cells and digestive tract cells divide throughout life Some every 6 hours Grow to a certain size and stop Controls are turned on and off During injury, cells are stimulated and rapidly divide and grow – produces new cells, .i.e. healing After healing, cell growth slows and returns to normal Uncontrolled cell growth results in cancer
Surface Area (length x width x 6) Volume (length x width x height) Ratio of Surface Area to Volume
Surface area and volume do not increase at the same rate Larger cells have difficulty exchanging oxygen and waste in
and out of the cell Before cell becomes too large it undergoes cellular division and forms 2 daughter cells
1
11/9/2011
Cell Cycle includes G1 phase
Two G phases and S phase make