MITOTIC CELL DIVISIONMITOTIC CELL DIVISION

Cell Reproduction Without SexCell Reproduction Without Sex

Cell Life Cycle

• cell life cycle includes a period of growth and preparation for cell division (blue). This period is called Interphase.

• mitosis is the period of time that the cell spends reproducing.

Plant Cell Mitosis

• the many stages of the cell life cycle can be seen in the image to the right

• the process of cell reproduction includes prophase, metaphase, anaphase and telophase

Interphase

• longest phase of life cycle

• G1 – phase of rapid growth and increase in protein and cell RNA

• S – synthesis phase when DNA duplicates

• G2 - phase of organelle development and growth in preparation for cell division

Prophase

• chromosomes appear• the nucleolus

disappears• the cell membrane

begins to break down

Very Late Prophase

• nuclear membrane has disappeared

• chromosomes start to move to the equator of the cell

• each chromosome has two identical chromatids

Metaphase

• chromosomes align along the equator of the cell

• spindles that are attached to the poles connect to the centromeres

Early Anaphase

• chromosomes are pulled to the poll by the contraction of the spindle fibers

• chromatids are separated at the centromere

Late Anaphase

• chromosomes begin to congregate at the poles

• the energy for this process if provided by the mitochondria

Early Telophase

• the new cell wall begins to form to separate the new cell

• the chromosomes begin to form a nucleus

Late Telophase

• the chromosomes start to uncoil and become less dense

• two new identical cells are formed

Mitosis Review

• all four stages of mitosis can be seen in this picture.

• note the process by which the red and blue chromosomes separate.

Interactive Mitosis Tutorial

This is an excellent interactive mitosis animation tutorial for high school biology

students.

http://www.sci.sdsu.edu/multimedia/mitosis/

Credits

• Bruce, Anne; http://www.microscopy-uk.org.uk/mag/artaug99/mitosis.html , Microscopy UK, August 1999.