BIOL 1000 Lecture Notes - Lecture 19: Microtubule Organizing Center, Spindle Apparatus, Sister Chromatids
17 May 2017
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Biology lecture 19: mitosis divided into five phases, prophase, prometaphase, metaphase, anaphase, telophase. In prophase chromatin forms into distinct structures known as chromosomes which consist of two sister chromatids. In middle of chromosome is the centromere attaching the sister chromatids. In prometaphase the nuclear envelop fragments and chromosome are free and begin to line up in the middle. In metaphase all of the chromosomes have lined up in the middle called the metaphase plate: anaphase is the ripping apart of the chromosomes to make two single stranded chromosomes, instead of double stranded chromosomes. In anaphase sister chromatids separate and move along the kinetochore microtubules toward opposite ends of the cell. Oct. 28, 2016: the microtubules shorten by depolymerizing at their kinetochore ends. In telophase, genetically identical daughter nuclei form at opposite ends of the cell. In animal cells cytokinesis occurs by a process known as cleavage, forming a cleavage furrow.
