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.
What was the first planet ever discovered? The simple answer is Earth. In reality out of the eight planets in our solar system, only two have been discovered, the rest are visible to the naked eye. So, with that in mind, Uranus was discovered by Sir William Herschel in 1781. The other planet was Neptune and was discovered by John Couch Adams in 1846. Pluto was discovered by Clyde Tombaugh in 1930 but in August 2006, under new definitions of a planet, Pluto was demoted to the status of a dwarf planet.