BILD 1 Chapter twelve

BILD 1 Chapter twelve - Chapter 12- The Cell Cycle Cell...

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Chapter 12- The Cell Cycle Cell cycle- the life of a cell from the time it is formed from a dividing parent cell until its own division into two cells 12.1 Cell division results in genetically identical daughter cells Cellular Organization of the Genetic Material Genome- a cell’s endowment of DNA, genetic information Chromosomes- where the DNA molecules are packaged Somatic cells have 46 chromosomes made up of two sets of 23, one from each parent. Reproductive cells or Gametes (sperm/egg cells) have half as many chromosomes as somatic cells, or one set of 23 chormosomes Chromatin- a complex of DNA and associated protein molecules, which make up eukaryotic chromosomes Distribution of Chromosomes During Cell Division Before the chromosomes condense, chromosomes are in the form of a long, thin, chromatin fiber After DNA duplication, the chromosomes condense: Each chromatin fiber becomes densely coiled and folded, making the chromosomes much shorter and very thick. Each duplicated chromosomes has two sister chromatids which are identical DNA molecule
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BILD 1 Chapter twelve - Chapter 12- The Cell Cycle Cell...

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