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.
We have been celebrating the first Neptunian year since the discovery of the eighth (and as far as we know last) planet in the Solar System. Neptune âs discovery was a famous triumph of nineteenth century astronomy. Less well-known is the aftermath, when a ninth solar planet was discovered. This planet was called Vulcan.