In people with chronic myelogenous leukemia, the chromosomes in the blood cells swap sections with each other. A section of chromosome 9 switches places with a section of chromosome 22, creating an extra-short chromosome 22 and an extra-long chromosome 9.
Discovered on September 23, 1846, by John Couch Adams. Neptune was the first planet found by mathematical prediction rather than by observation. Unexpected changes in the orbit of Uranus led astronomers to deduce that its orbit was subject to gravitational perturbation by an unknown planet.
September 23, 1846 by Johann Gottfried Galle. Neptune was discovered on September 23, 1846, by by Johann Galle and Heinrich d'Arrest at the Berlin Observatory, using a predicted position by Urbain LeVerrier. 54 people found this useful.