Biology 1201A Lecture Notes - Lecture 4: Microtubule, Allele, Telomerase
21 Nov 2016
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Stem cells, generating different tissues: can turn into any other type of tissue, do(cid:374)"t di(cid:448)ide equall(cid:455, other dna helps it turn into a particular type of tissue. External/environmental cues to signal cell divisions: growth factors, ex: hormones, death of nearby cells, communication from nearby cells, nutrients, cell size. Cues to stop cell division: lack of growth factors, crowding (contact inhibition, shortened telomeres leading to dna damage. Interphase: g1-cells grow, s- dna synthesis and replication, g2- prepping for mitosis, m- mitosis. Cytokinesis: actual cell is split into two. Mitosis: separation of nucleic contents into two equal parts, *nuclear division that produces nuceli that are exact genetic copies of the parental nucleus, **mitosis is the process that divides replicated dna into two equal parts. Sister chromatids are glued together along their length by cohesion. Mitotic spindle is composed of microtubules (cytoskeleton components rearranged) Microtubules slide past one another, push poles apart. Do(cid:374)"t e(cid:454)pect us to k(cid:374)o(cid:449) the (cid:374)a(cid:373)es of all these c(cid:455)cles.
