LIFESCI 2 Lecture Notes - Lecture 7: Sister Chromatids, G0 Phase, Nuclear Membrane
14 Sep 2016
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Document Summary
Cell cycle the sequence of growth and division. Muticellular cell division is more controlled, while prokaryotes do it based on external cues. Chromosome linear dna in eukaryotes along with stabilizing and packaging proteins diploid two sets (23 pairs, 46 chromosomes). (2n) n is the number of pairs haploid one set polypoid more than two sets (plants) Each copy goes into a separate daughter cell. Varies the most between cells in terms of length. Mitosis and cytokinesis an hour or less. G1 to g0 phase for cells that don"t divide. Centrosome splits and migrate to spindle poles and develop mitotic spindles (spindles = microtubules) Kinetochore microtubules attach to kinetochore of each chromosome pair. Karyotype looking at karyotype of an individual. Controlled by growth factors extracellular signals, contact inhibition. Make 4 haploid gametes (have 23 chromosomes, the n number) from one parent cell. ** increase variability of offspring"s through crossing over and independent assortment. Crossing over recombine genes in new combination.
