Cell Cycle & Division
All Materials Cmassengale

Cell Division:

Reasons for Cell Division:

Copying DNA: 

Replication process

Chromosomes & Their Structure:

Diagram of how genes make up a cell

Chromosome Numbers:


Homologs

Organism Chromosome Number (2n)
Human 46
Fruit fly 8
Lettuce 14
Goldfish 94


Human Male Karyotype

Genes:

Cell Cycle:

Interphase:

Cell division in Prokaryotes:


Cell Division in Eukaryotes:

Stages of Mitosis:

Cytokinesis:

Summary of Mitosis:

 

 

 Interphase

  1. Cell matures & carries on normal activities

  2. DNA copied & appears as chromatin

  3. Nucleolus visible

 Early Prophase  

  1. Chromosomes condense & become visible

  2. Centrioles separate & spindle starts forming

 
 Late Prophase
  1. Spindle forms with aster at each pole

  2. Nuclear membrane & nucleolus disintegrate

  3. Centromere of chromosomes attaches to spindle fibers

 Metaphase
  1. Chromosomes line up at the equator of the cell attached to kinetochore fibers of spindle

 Anaphase
  1. Centromeres split apart

  2. Homologs move to opposite poles of the cell

 Telophase/Cytokinesis  
  1. Nuclear membrane & nucleolus reform

  2. Cell pinches into 2 cells in animals

  3. In plants, a cell plate separates the 2 new cells

 

Cancer is Uncontrolled Mitosis:

Meiosis & Sexual Reproduction

 


Oogenesis

 


Spermatogenesis

Meiosis I:

 

Asexual & Sexual reproduction: