methods of Reproduction
sexual
asexual
events during cell division
called binary fission
they have one circular chromosome
go through steps
cellular activities from one cell division to another
phases
interphase - period of cell growth; DNA is replicated
mitosis - separation of the chromosomes (nuclear division)
cytokinesis - physical separation of the cell in two (cytoplasmic division)
Prophase | the chromosomes coil and become more compact; the nuclear envelope breaks down; the spindle begins to form; the chromosomes attach to the spindle fibers |
Metaphase | the spindle fibers pull on the chromosomes until the chromosomes are lined up at the center of the cell |
Anaphase | the spindle fibers continue to pull on the chromosomes until the DNA copies (chromatids) separate from one another and are pulled to the ends of the cells; other spindle fibers are pushing the two ends of the cell away from each other |
Telophase | when the chromosomes are at opposite ends of the cell, they start to uncoil again; the nuclear envelope re-forms; the spindle fibers disappear; cytokinesis begins |
© Carol L. Wymer, 2004