Why do cells divide?
-Reproduction (unicellular organisms)
The process of nuclear division.
The prep stage for mitosis.
Gap 1: Cell growth (All organelles & cytoplasm double in number)
Synthesis: DNA replication (DNA doubles)
Gap 2: Prep for mitosis (All structures associated with mitosis double)
Stages of Mitosis
-Nuclear membrane disappears.
-Chromosomes shorten and thicken to become visible.
Chromatids align along the equator (middle) of the spindle.
Chromatids separate and chromosomes move to the opposite poles of the spindle.
-Chromosomes lengthen and become thin.
-Nuclear membrane forms.
The division of cytoplasm
Cytokinesis in Animal Cells
Cell Furrow or Cleavage Furrow
Cytokinesis in Plant Cells
How are cancer cells different from healthy cells?
Unlike healthy cells, cancerous cells have lost their ability to control their growth rate and will continue multiplying even after touching other cells.
Interphase, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis
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The process of the formation of gamates (reproductive cells)
How many chromosomes do humans have?
The cell that divides to produce the gametes.
A reproductive cell.
Number of chromosomes in a germ cell
Number of chromosomes in a gamete
Small cells produces and discarded due to too little cytoplasm during formation of female gamete
Stages of Meiosis
-NO INTERPHASE 2 (No 2nd DNA replication)
Distinguish between Mitosis & Meiosis
Mitosis: 1 division, creates 2 cells identical to the original (parent) cell with 46 chromosomes in humans, creates body (somatic) cells
Meiosis: 2 divisions, creates 4 cells with half the genetic information as the original (parent) cell with 23 chromosomes, creates reproductive cells (gametes: egg & sperm)