Tag Archives: chromosomes

Mitochondrial DNA: a maternal gift

Marshall Lichtman Rochester, New York, United States   Human haplogroup tree rooted at Mitochondrial Eve. By Wapondaponda. 2009. Via Wikimedia. CC BY-SA 3.0 DNA is arrayed on twenty-three pairs of chromosomes in human cell nuclei. It is coiled tightly around proteins called histones that together with DNA form a chromosome. The largest chromosome carries several […]

The first description of DNA: a six million dollar letter from Francis to Michael Crick

Marshall A. Lichtman¬† Rochester, New York, United States   Figure 1. The boyish appearing James Watson (left) and the Francis Crick with their three-dimensional model of DNA in their Cavendish Laboratory office at Cambridge University, United Kingdom. Circa 1953. Photo credit: A. Barrington Brown/Science Photo Library. Via the Rockefeller University Digital Commons. In the April […]