BIO 1140 Chapter Notes - Chapter 8: Cyclin E, Telomere, Cytoskeleton
18 Aug 2016
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Prokaryotes divide by way of binary fission, thought of as three periods. B period- growing of cell before dna synthesis. C period- chromosomes are replicated and separated at opposite poles. D period- membrane pinches together, two daughter cells. *in diagram, chromosome looks extended but is actually compacted in a central region- the nucleoid. *b period may be skipped if nutrients are abundant. 8. 2b replicated chromosomes are distributed actively to the halves. *not passively by way of new plasma membranes (francois jacob) Begins are ori in the middle of cell (locations for enzymes of dna replication) As ori are duplicated, the new orgins migrate to the poles of the cell as replication continues. (mechanism to move to poles unknown) Then cytoplasmic division with inward constriction of cytokinetic ring. (d period) 2n (23 pairs, 46 chromosomes) haploid = n. Replication of new chromosomes creates sister chromatids, held by a centromere until mitosis.
