Biology 1002B Lecture Notes - Lecture 16: Comparative Genomics, Chloroplast, Xist (Gene)
15 Mar 2013
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Document Summary
Epigenetic changes do not change the dna sequence and are persistent (they stay beyond the particular event that causes the changes in the first place) Regulation of gene expression affords the possibility of specialization. Volvocine algae provide a productive model system. When chlamy wants to divide, it loses its flagella. Volvox is a transparent sphere with many somatic cells and a hand-full of reproductive cells. Getting cells to cooperate with each other may not be as hard as imagined. From a to b, the cells seem to have differing sizes into somatic and gonidial cells. In continued division, the gonidial cells move to the outside of the embryo and stop dividing while the somatic cells continue to divide with their flagella on the inside. The embryo undergoes inversion, to flip themselves inside out so that the gonidial cells are on the inside. Juvenile and parental spheriods enlarge by accumulating ecm.
