Meiosis

MEIOSIS

 

Meiosis is the reduction-division of the chromosomes

- gametes (sex cells)

- haploid [4 daughter cells] = 23 chromosomes each

 

PROCESS OF MEIOSIS

1. Interphase

2. Meiosis I

   * Prophase I - Finds its homologous pair/crossing over occours

   * Metaphase I - Lines up down the "middle" with its tetrad

   * Anaphase I - Split tetrad and they move away from one another

   * Telophase I - Begins to pinch inward to make 2 new cells & nucleus re-forms (cytokinesis)

   * Cytokinesis - Splitting of the cell

3. Meiosis II

   * Prophase II - Nucleus dissolves, spindle fibers form; chromosomes condense

   * Metaphase II - Line up down the middle

   * Anaphase II - Splits the chromatids at the centromere

   * Telophase II - Cells begin to pinch inwards/nucleus reforms

   * Cytokinesis - Splitting of the cell

 

 

Example of crossing over and tetrad