BIOL 1201 Chapter : Ch 11- 13

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15 Mar 2019
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Multicellular organisms depend on cell division for: development from a zygote, growth, repair. Cell division is an integral part of the cell cycle, the life of a cell from formation to its own division. Most cell division (mitosis) results in daughter cells with identical dna: somatic cells identical to each other and parent cell. Meiosis produces non-identical daughter cells (gametes: sperm and egg cells) All the dna in a cell constitutes the cell"s genome. Dna molecules in a cell are packaged into chromosomes. Every eukaryotic species has a characteristic number of chromosomes in each cell nucleus. Somatic cells (non-reproductive cells) have two sets of chromosomes (1 from each parent) Gametes (reproductive cells: sperm/eggs) have half as many chromosomes as somatic cells eukaryotic chromosomes consist of chromatin, a complex of dna and protein that condenses during cell division. In preparation for cell division, dna is replicated and the chromosomes condense.

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