Concept 12.1

Cell Division results in genetically identical

daughter cells.Namroo AnnapareddyWilliam ChenBenjamin HuangMaggie McCormick

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.

The Key Roles of Cell Division!

Cell Division: the reproduction of cells; its purpose is for reproduction, growth and development, and tissue renewal

Cell Cycle: the life of a cell from the time it is first formed from a dividing parent cell until its own division into two cell

http://www.youtube.com/watch?v=rgLJrvoX_qo

Cellular Organization of the Genetic MaterialGenome: a cell’s genetic information,

packaged as DNAEukaryotic chromosomes are made of

chromatin, a complex of DNA and associated protein

DNA molecules are packaged into chromosomesChromosomes: a threadlike, gene-

carrying structure found in the nucleus

Figure 12.3

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 hasa narrow “waist” called thecentromere, where the sisters are attached.

Types of Cell DivisionMitosis: The division of the

nucleus, and is usually followedimmediately 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.

Video!!http://www.youtube.com/watch?v=Q6ucKWII

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THE END!