INTRODUCTION TO CELL CYCLE AND CELL DIVISION
All organisms reproduce.
Reproduction has a cellular basis.
All cells come from pre-existing cells
Cell division enables living things to repair damage, grow and produce offspring
• Sexual reproduction, two parents are involved and the genetic material combines. Union of sex cells (egg and sperm).
• Some organisms reproduce by simple cell division (asexual reproduction). Ex. Paramecium (unicellular), and Sea stars (multicellular).
Cell division
Process by which a parent cell divides into two daughter cells.
Mitosis Meiosis
Each daughter cell is genetically identical to the parent cell.
Chromosomes in the daughter cell is reduced by
half
THE CELL CYCLE
Eukaryotic cells undergo a sequence of events known as the CELL CYCLE.
The cell cycle goes from the birth of a cells until it reproduces.
90% of the cell cycle in interphaseS phase 3-6 hours.
INTERPHASE
Duplication of chromosomes.
Cell increases supply of proteins
and # of many organelles.
Cell carries out metabolic processes
S DNA Synthesis.
G Gap.
Chromosomes are loosely packed as chromatine fibers.
G Gap.
Cell is ready for mitosis.
Mitotic phase
Includes 2 processes:
Mitosis
Cytokinesis.
Mitosis: Nucleus and chromosomes divide.
Cytokinesis: is the process by which the cytoplasm is divided in two.
Error in chromosome distribution is 1 in 100 000 cell divisions.
Centrioles are only present in animal cells.They help organize the microtubules.Self replicating
http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_the_cell_cycle_works.html
http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__mitosis_and_cytokinesis.html
Cytokinesis in Animals and Plants
Concept check
1. Describe a significant event that occurs in each of the four stages of mitosis.2. Compare and contrast cytokinesis in animal and plant cells.3. In what sense may prophase and telophase in mitosis be characterized as opposites?
homework
Mitosis
Meiosis
Allele
Somatic Cells
Nucleus
G1 Phase
Interphase
G2 Phase
Chromatin
Research two different biological concepts for the following words indicating the source of each concept:
http://www.iflscience.com/health-and-medicine/mesmerizing-gif-shows-cell-division-real-time