National Human Genome Research Institute has a nice talking glossary of genetic terms. I especially this figure that shows a chromosome and how is it organized, i.e., DNA is wrapped with histones etc. However, there is only one chromosome and this is suboptimal if one wants to show the relationship between the genotype and DNA. Therefore I picked one version from the net (I do not remember where) and changed it a bit. I am publishing it here so that others might benefit as I did. There is plenty of place to annotate it.