1. What directs a cell's activity?
2. What is the molecular unit of heredity?
3. Why is cell division necessary?
As a cell grows, it gets larger. Eventually it divides and forms two daughter cells. Each daughter cell then grows, gets larger, and divides. This repeating sequence of cellular growth and division is called the cell cycle.
MITOSIS & MEIOSIS
mitosis (video) - process of cell division in which the nucleus of a cell divides and forms two nuclei, each with a complete set of chromosomes identical to the original cell; occurs in somatic (body) cells
cytokinesis - the divison of the cytoplasm of a cell; cytokinesis follows the division of the cell's nucleus and happens in both mitosis and meiosis
interphase - the first three of five phases of the eukaryotic cell cycle; period of cell growth before cell divison
somatic cells - body cells (brain, nerve, muscle, etc)
meiosis (video) - a process in cell division during which the number of chromosomes decreases to half the original number by two divisions of the nucleus, which results in the production of sex cells (gametes or spores)
germ cells - in a multicellular organism, any reproductive cell
gametes - a reproductive cell that unites with another reproductive cell to form a zygote; sperm, egg, or spores; produced during meiosis
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