* Simple cell division. It is how you became you!
* In prokaryotic organsims it is called "binary fission"
* It is considered a method of asexual reproduction in many organisms.
* It is also how skin replaces itself along with many other cells!!
The Phases of Mitosis
A. Interphase- This includes all but...Mitosis & Cytokinesis
- 1. G1- cell grows to maturity. DNA "replicates"
- 2. S- DNA is copied!
- 3. G2- cell rapidly grows & waits for cell division
- 4. G0- phase in which no more cell growth or division takes place.
B. Mitosis
- 1.General Comments
- A. Mitosis is how a cell divides its chromosome in half to get another identical cell. Each new cell has the exact # of chromosomes and DNA information as the orginal daughter cell. This only makes sense. You do not want skin cells dividing and their offspring turn out to be intestine cells!?! That could get messy!!
- Follow the pictures on the link below for a guide as to what happens during mitosis!!1
Cytokineses
A. This is the dividing of the cytoplasm and the pinching off of the new cell. The wall that is created is called a "Cleavage line"
B. Each new cell has the same amount of organelles, DNA, & cytoplasm!
Meiosis
General Comments
* Meiosis is always sexual reproduction.
* Meiosis is the reduction of the diploid # of chromosomes to get haploid gametes.
* It follows many of the same phases as mitosis.
Key Terms
A.Independant Assortment
B.Genetic Recombination
C.Crossing Over
D.Spermatids/Spermatogenesis
E.Oogenesis/Polar Bodies
Homework
TEST 12/13
Homepage
Good Mitosis/Meiosis Link
Good Mitosis/Meiosis Link
