Photosynthesis and Respiration

Photosynthesis: plant cells making glucose for energy light 6 CO2 + 6H2O → C6H12O6 + 6O2 carbon water glucose oxygen dioxide

This process is the opposite of respiration This process is the opposite of respiration.   It stores energy from the sun in the form of food.

  Respiration: all cells release energy when they “burn” fuel/food

This process is the opposite of photosynthesis. Respiration RELEASES energy from fuel/food.

Mitosis Meiosis

Mitosis is the process in which the nucleus divides to form two new nuclei. produces two daughter cells that are identical to the parent cell. 

Animated Mitosis Cycle http://www.cellsalive.com/mitosis.htm Interphase Prophase Metaphase Anaphase Telophase & Cytokinesis

Interphase Cell prepares for division by: Parent Cell Cell prepares for division by: Chromosomes are copied (# doubles) Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Prophase Mitosis begins (cell begins to divide) Nucleus disappears . Centrioles (or poles) appear and begin to move to opposite end of the cell. between the poles.

Chromosomes line up in the Middle Metaphase Chromosomes line up in the Middle

Chromosomes separate and move to opposite sides. Anaphase Chromosomes separate and move to opposite sides.

The cell divides into two. (Two new nuclei form) Telophase The cell divides into two. (Two new nuclei form) The nucleus re-forms

Cytokinesis occurs after mitosis Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.

Animal Mitosis -- Review Interphase                                                              Prophase                                                              Metaphase                                                              Anaphase                                                              Telophase                                                             

Cell Cycle 17

- Cell Division The Cell Cycle 18 18

Mitosis Animation http://www.cellsalive.com/mitosis.htm

Meiosis

Produces sex cells Sperm eggs Goes through the same phases as mitosis, only it goes it twice Produces 4 new cells Meiosis = half number of chromosomes

Second Division Prophase II Telophase II Metaphase II Four cells with half the number of chromosomes as the original cell Anaphase II Daughter Cells

Summary http://media2.caboces.org/htbin/wwform/118?T=CV11605#multimedia_resources_CV11605 http://www.powermediaplus.com/player.asp?mediaID=11605&segmentID=150603 mitosis: interphase, prophase, metaphase, anaphase, and telophase = 2 cells meiosis: prophase 2, metaphase 2, anaphase 2, and telophase = 4 daughter cells