Biology 1001A Lecture Notes - Lecture 7: Cell Plate, Telophase, Chromosome Segregation
6 Dec 2017
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8. 1- the cycle of cell growth and division: an overview. New progeny cells are needed for expanding population size, multicellular tissue growth, asexual reproduction and replacement of cells lost to wear (shedding skin) and tear (wound repair) If cells divide too quickly, daughter cells may be too small or lacking cytoplasm/genetic material. If cells divide too slowly, they may grow inefficiently large or accumulate extra chromosomes. Not all cells in a multicellular organism are designed to divide right away, and some are even designed to die immediately. Must double in size, replicates its circular chromosome, and move each of the resulting daughter chromosomes into its own progeny cell. Entire mechanism of prokaryotic cell division is (cid:498)binary fission(cid:499) Chromosomes separated to either end of the cell (c period) Membrane cleaves between two daughter cells (d period: splitting or dividing into two parts. Replication occupies most of the cell cycle in rapidly diving prokaryotic cells.
