Biology 1001A Chapter Notes - Chapter 9: Spindle Apparatus, Sister Chromatids, Microtubule Organizing Center
15 Mar 2015
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Chapter 9 - *** most cells are in interphase. The increasing size, developmental complexity, and diversity of functioning of multicellular eukaryotic organisms require strict control of cell division. Actively dividing: meristem tissues of plants, step cells of animals. Reasons for division: needed for growth. New leaves: asexual reproduction and replacement of cells lost to wear. Shedding skin & gut lining: tear. Sequence of events a period of growth followed by nuclear and cytoplasmic division. Molecular checks & balances: timely and orderly progression: synthesis of dna. Replicates each dna chromosomes into two copies: structural & mechanical web of cytoskeleton. Interwoven cables and motors that separates the dna copies precisely into daughter cells. Produces necessary daughter nuclei different in that they have only half the number of chromosomes as the parental nuclei. Many of the genetic traits carried by these daughter nuclei are in different combinations of those of the parent cell. Spores are products for plant and fungi cells.
