CHAPTER 10ALL CELLS COME

FROM CELLS.

REPRODUCTIONAsexual reproduction-produces offspring that inherit all their genetic material from just one parentExample: Sea Stars and Plants

REPRODUCTION CONTINUED….Sexual reproduction- two parents are involved in the production of offspring.Examples: Egg and Sperm

REPRODUCTION CONTINUED…Asexual and Sexual Reproduction-some unicellular and multicellular organismsExamples: Slime molds and Sea Anemones

Can you think of some reasons why some organisms can do both?

REPAIR AND GROWTH Take a moment to look at the skin on your arm. Did you know that the outermost layer is

actually dead cells? New cells are gradually moving toward the

surface, replacing dead cells that have rubbed off.

Asexual or Sexual reproduction? The replacement of lost or damaged cells is

just one of the important roles cells reproduction plays in your life. Another is growth-simply increasing in size from a baby to a child to an adult.

THE CELL CYCLE MULTIPLIES CELLS. Chromosomes and Cell Division

1. Chromatin-a combination of DNA and protein molecules

2. Chromosomes-when a cell divides, its chromatin fibers condense, becoming visible as they compactHuman Body = Has how many chromosomes?

Each chromosome may contain hundreds of genes

CHROMOSOMES AND CELL DIVISION CONTINUED… Sister chromatids-two identical joined copies

of chromosomes. Centromere-the region where the two

chromatids are joined tightly together. *Draw Figure

CELL CYCLECell Cycle-Eukaryotic cells that divide

and undergo an orderly sequence of events.Interphase-the stage during which

a cell carries out its metabolic processes and performs its functions.The cell may spend as much as 90 percent of the cell cycle in interphase.

CELL CYCLE CONTINUED. Cell Cycle includes =

Interphase and the M Phase (Mitosis)

Interphase is divided into: 1. G1 phase-cell grows 2. S phase-genetic material is duplicated 3. G2 phase-cell prepares to divide

4. M phase (Mitosis) is divided into Prophase Metaphase Anaphase Telophase/Cytokinesis *Goes in order from 1 through 4.

DRAW FIGURE

MITOTIC PHASEMitotic phase-the stage of the cell cycle when the cell is actually dividing.Includes two processes:Mitosis and cytokinesis

MITOTIC PHASE CONTINUED…Mitosis-the nucleus and the duplicated chromosomes divide and are evenly distributed forming two “daughter” nuclei.Unique to eukaryotes

MITOTIC PHASE CONTINUED…

Cytokinesis-process by which the cytoplasm is divided into two.

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