BIO 190 Chapter Notes - Chapter 2: Nucleolus Organizer Region, Telomere, Chromatin
16 Sep 2013
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Document Summary
Chromatin varies in compactness along the length of the chromosome. Dense chromatin is often found flanking the centromere. Dense is called herterchromatin and the less dense is called the euchromoatin. In the chromosome, the nuclear organizer is a unique region that is usuyally on a specific chromosome, which contains mutiple repeats of ghenese encoding ribosomal rna. When chromosomes are stained chriomsomes of some specicies show characterisitc transverse chromosola bands. Genes are transcribed segments that are arrayed along the dna of a chromosome. Equal segregation can be observed directly withing one indiividual meiocyte. This is because in the organsms cyclews the four porducts of a single meiosis is temporarily held together in an ascus. If the four spores from one ascus is isolatedand used to generate coolonies then equal segragation within one meiocyte is revealed. A cross requires the analysis of only one meiosis but diplod cross requires a consideation of meiosis in both male and female.
