Biology 1002B Lecture Notes - Lecture 16: Xist (Gene), Somatic Cell, Microtubule
15 Apr 2013
School
Department
Course
Professor
Document Summary
What to see on the dna picture: dna binding sites, dna methylation. Clicker question: which of the following regulation mechanism is not epigenetic . Cannot change the dna sequence, not mutations: not mutations. Persistent beyond the original conditions where the regulation is started: last for the whole life. Lac binding is not epigenetics because lac varies, Binding of xist rna is epigenetics, persistent, whole life will be inactive. Regulation of gene expression affords the possibility for specialization : genetic vs. epigenetics. Clicker question: multicellular life is monophyletic . Multicellularity evolved several times: some groups have some unicellular organism and some multicellular organisms, multicelluarity has evolved multiple times. Volvox: some cells are big and some are small, ecm, extra cellular matrix. Volvox embryology: 1 cell divides in 2, 4, 8, 16 undifferentiated, a symmetric division is very important, the large cells will become reproductive cells, the small cells will become somatic cells.
