HSCI 100 Lecture Notes - Lecture 4: Cleavage Furrow, Nuclear Membrane, Dna Replication

• School: Simon Fraser University
• Department: Health Sciences
• Course: HSCI 100
• Professor: Mark Lechner

Document Summary

Interphase: g1 stage = growth, cell grows in size, proteins needed for dna replication are synthesized, s stage = dna synthesis, dna replication occurs, g2 stage = growth, proteins needed for division are synthesized. Cell division: mitosis nuclear (chromosome) division, cytokinesis cytoplasmic division. Mitosis: human cells: diploid to diploid (2n to 2n, 4 phases, prophase. > microtubules attach to centromeres via a special protein junction called a kinetochore (so that they split evenly: key components, chromosomes, microtubule spindles (mt); cytoskeletal proteins. I: chromosomes condense and become visible, nuclear envelope fragments, nucleolus disappears, centrosomes move to opposite poles, spindle (microtubules) ]ibers appear and begin attaching. Chromosomes line up at the middle of the cell to centromeres (equator), aka the metaphase plate attached. Anaphase: sister chromatids separate at the centromeres and move. Meiosis: 2 divisions occur to make 4 haploid (n) cells, used to make gametes (egg and sperm, occurs only in germ cells. Production of eggs: what cells can do.