Print this Web Links Activity Log to record your findings. In order to view and print these activities, it is necessary to have Adobe Acrobat Reader. If you do not have this, get the free download now.   Click the Techie Toolbox for tips and help to make the most of your time on the Web. Chapter 13: Genes and Chromosomes Cytogenetics Gallery Visit this site to see what chromosomes look like under the microscope and to learn more about them. How many DNA bases are in a single chromosome? What is one way cytogeneticists identify chromosomes? How do they identify chromosomal abnormalities? People and Discoveries This PBS site outlines the work of James Watson and Francis Crick in their work with DNA. Read the article and then click on "DNA Workshop" at the bottom of the page. Then, do the activity to practice matching base pairs in DNA replication and protein synthesis. From DNA to RNA This site provides a good description of what happens during RNA transcription. What are the principle events in transcription?