DGS 3222 Chapter Notes - Chapter 2: Gamete, Electron Microscope, Inner Cell Mass
12 Aug 2016
School
Department
Course
Professor
Document Summary
Nucleoli: one to four small nucleoli may be seen in normal interphase cells, form at the nucleolus organizing regions (nor) of the acrocentric chromosomes. 14: ribosomes originate here, nucleoli are larger and more numerous in metabolically active cells. In metabolically active cells, nucleoli stain a darker red. Tissue case repair; regenerating tissue (right: the average mammalian cell cycle lasts 18 hours. Progressive coiling and condensation of the doubled chromosomes. Chromosomes begin to become distinguishable & discrete as long, thread-like structures. Prometaphase a short period between prophase and metaphase. Centrioles have divided and move to opposite poles. Chromosomes line up on the metaphase plate attached to the spindle fibers by their kinetochores. Kinetochores are not part of the dna; they"re a separate structure. Cytogenetic studies are traditionally performed on metaphase cells. Sister chromatids move alone the spindle fibers to opposite poles. Chromosomes uncoil and become indistinguishable as separate structures. Usually followed by cytokinesis and cytoplasmic division.
