Cell Reproduction Mitosis and Binary Fission

Three Schemes

Major Events in Mitosis

Vocabulary MitosisMitosis = division of the cell nucleus and its contents CytokinesisCytokinesis = the division of cell cytoplasm into two identical daughter cells ChromatinChromatin = the combination of DNA and histone proteins DiploidDiploid = Two copies of each chromosome, one paternal, one maternal

Chromosomes in the Larger Scheme

Chromosome Structure  1 – Chromatid  2 – Centromere  3 – Short arm  4 – Long arm

Telomeres  Do not code for genes  Keep ends of chromosomes from sticking to each other  Prevent loss of genes

The Cell Cycle

Prophase

Metaphase

Anaphase

Telophase

Cytokinesis

Mitosis in Onion Root Tip

Binary Fission  The primary method of reproduction for prokaryotes  Does not require a mate  Is asexual reproduction  Does not increase the variation in a population

Binary Fission Central growthApical growth