BISC207 Lecture Notes - Lecture 18: Telophase, Kinetochore, Microtubule

• School: University of Delaware
• Department: Biological Sciences
• Course: BISC207
• Professor: Nauen Jennifer

Document Summary

Forms 2 daughter genetically identical daughter cells. Consists of 5 phases that occur after interphase. Prometaphase: nuclear membrane breaks down, spindle forms, kinetochore microtubules attach to kinetochore proteins. Metaphase: sister chromatids asign on metaphase plate. Anaphase : sister chromatids separate and move to poles. Telophase and cytokinesis: nuclear membrane reforms; daughter cells separate. Reduction division: e. g. n daughter cells produced from a 2n parent cell. 2 round of division (meiosis i and meiosis ii) Homologous chromosomes, already duplicated, synapse (=pair) to form bivalents. Synapsed chromosomes exchange some material (=crossing over) Metaphase i: bivalents randomly align on plate. Anaphase i: homologous chromosomes move to separate poles. Telophase i & cytokinesis i: haploid daughter cells separate. Two processes increase genetic diversity in meiosis i: Random alignment of chromosomes on metaphase plate (metaphase i) Prophase ii: no tetrads or crossing over) Metaphase ii: sister chromatids align on plate. Anaphase ii: sister chromatids separate; chromosomes move to separate poles.