BIO 2133 Lecture Notes - Lecture 3: Intron, Barr Body, Satellite Dna
26 Oct 2014
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Dna that they have is very short, but long enough to have the genes to infect the host, easily accessible because it is the only thing that makes a virus. Easily manipulated for gene transfer and changing its genome. Eggs must survive in a harsh environment due to external fertilization, acts as protection. With the gene expression already expressed, the external fertilization allows for immediate change and expression of genes, instead of waiting: chromatin and condensed chromosome structure: linear structure, helix histones solenoid chromatin fiber chromosomes. One x inactive, one barr body, 5 x, 4 barr bodies. Males (xy) have no inactive genes: molecular anatomy of chromosomes, c-banding, isolate the dna, stain it. A condition occurs because of the distance and because of crossing over ( used to identify and discover diseases: repetitive dna in the genome, highly repetitive: satellite dna. Behaviour: spinning them fast in a centrifuge, break apart. Localized to the heterochromatic centromeric regions of chromosomes.
