MITOSIS. Asexual Reproduction Reproduction with only one parent offspring are identical to...
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Transcript of MITOSIS. Asexual Reproduction Reproduction with only one parent offspring are identical to...
Sexual Reproduction
Requires 2 parentsNew individual is produced by
the union of the nuclei of two specialized cells (sperm & egg)
Chromosomes
Structure in cells that undergo division and that contain hereditary information of the organism
In mitosis the chromosomes that undergo cellular division are called autosomes
CELL CYCLE
Cycle that a cell goes through in order to make new cells
If an organism is unicelluar, than a new organism is created via the cell cycle
Cell Cycle Consists of Two Parts:
Mitosis:– Division of the
nucleus to form two identical nuclei
– REMEMBER: Hereditary material is found in the nucleus
Cytokinesis–Division of the
cytoplasm of the cell after mitosis
Interphase
Stage when a cell is between mitotic cycles:
A. G1- cell grows
B. S- DNA replication
C. G2- Organelle replication
Prophase
Chromosome become visible
Centrioles move to opposite poles of the cells
Microtubules form spindles
Spindle fibers become attached to centromeres
Nuclear membrane disappears
Nucleolus disappears
Metaphase
Chromosomes attach to the microtubule spindles
Chromosomes line up on the equator of the cell
Anaphase
Centromeres double
Chromosomes(sister chromatids) move to opposite poles
Division (cleavage furrow) appears
Telophase
Begins when chromosomes reach the poles
Chromosomes uncoil and become invisible
Spindle disappearsNuclear membrane formsNucleoli reappear
Mitosis & Cytokinesis in Plant Cells
Main events are the same Plants do not have centrioles or
asters Cytokinesis cannot occur by
pinching off of membrane. A cell plate forms between the new cells during anaphase or telophase