BIO130H1 Lecture 11: BIO130 Section 2 Lecture 11 and 12.docx
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BIO130H1 Full Course Notes
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The cell cycle: m phase: the nucleus and cytoplasm divide mitosis (nuclear division), cytokinesis (cytoplasmic division) Interphase: the period between cell divisions g1 phase (first gap phase when cell growth happens. Extra cytoplasmic content of cell are growing and dividing), s phase (where dna is replicated), g2 phase (second gap phase, before cells enter the m phase) Cell cycles in multicellular organisms: many mature cells do not divide: eg. nerve cells, muscle cells, rbc. As they become specialized they lose ability to divide. Some cells can also renew themselves able to differentiate to more than one type of cell. Prior to entry in s phase start site check point (restriction point). Cells need quo to proceed from g1 to s phase. Triggers anaphase where chromosomes pulled to opposite pulls. Check if all chromosomes at spindles and connected ensures each daughter cell at right place 1 copy each)