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.
Two other planets, Uranus and Neptune, were discovered after the telescope was invented in the early 1600s. Astronomer William Herschel, who is credited with discovering Uranus in 1781, wanted to call it âGeorgium Sidus,â (Georgeâs Star) for the British ruler at the time, King George III.