2. The Latin axiom: Omnis cellula e cellula: “Every cell from a cell.”The ability of organisms to reproduce their own kind is one characteristic that best distinguishes living things from nonliving matter.
3. The Key Roles of Cell Division!Cell Division: the reproduction of cells; its purpose is for reproduction, growth and development, and tissue renewalCell Cycle: the life of a cell from the time it is first formed from a dividing parent cell until its own division into two cellhttp://www.youtube.com/watch?v=rgLJrvoX_ qo
4. Cellular Organization of theGenetic Material Genome: a cell’s genetic information, packaged as DNA Eukaryotic chromosomes are made of chromatin, a complex of DNA and associated protein DNA molecules are packaged into chromosomes Chromosomes: a threadlike, gene-carrying structure found in the nucleus
5. Figure 12.3
6. Distribution of Chromosomes During Cell Division When a cell is not dividing, the DNA is preparing for division. When chromosomes are duplicated, it forms sister chromatids. The duplicated chromosome has a narrow “waist” called the centromere, where the sisters are attached.
7. Types of Cell Division Mitosis: The division of the nucleus, and is usually followed immediately by cytokinesis, the division of the cytoplasm. Meiosis: Produce gametes (egg + sperm cells). Has 1 set of chromosomes, and yields non-identical daughter cells. This only occurs in the gonads.