O Levels Biology Cell Division

Chai Hao Wei (17) 311 Biology Chapter 18: Cell Division addition: durable growth in size accompanied by cubicle particle and differentiation Mitosis: Cell division during growth * Growth in plants restricted to emergence efflorescences: shoot and root tips A nuclear division such that the daughter nuclei produced contain the same number of chromosomes as the stir nucleus * Non-dividing stage of a cell (still absorb nutrients and build protoplasm) * Chromosomes attend as massive thin wind called chromatin which cannot be distinguished one by one * Centrioles in animal cells divide and chromatin threads double up Interphase nuclear envelope centrioles chromatin cytoplasm Zygote cells drive to be genetically stalls for the embryo to develop rulerly. paying back of Chromatin Threads 1. Two similar chromatin threads produced drum roll and shorten to become chromosomes 2. each(prenominal) chromosome co nsists of two equivalent DNA molecules called sister chromatids. 3. Chromatids joined at a point called centromere.

Cancer : un controlled division of cells * Mistakes in DNA replication or mitosis * Cells lose the ability to control the way they divide and normal functions Asters Centrioles Prophase Chromatin threads condense, coil and shorten to become chromosomes. separately chromosome consists of two sister chromatids affiliated at the centromere. The chromosomes be at one time visible under a microscope. sister chromatids (one chromosome) centromere young prophase: * Nuclear Envelope disintegrates * Spi! ndle take a leaks with arbor fibres extending from one rod of the cell to the other In animal cells: * Structures called asters(made up of microtubules) form around centrioles * Centrioles move apart to opposite ends of cells Microtubules are fag protein structures found in cytoplasm of cells. They provide morphologic deem and help to move substances within the cell. Spindle Fibres forming...If you expect to keep up a full essay, order it on our website: OrderCustomPaper.com

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