Video: Nondisjunction and Aneuploidy. Learn why proper chromosome segregation is essential during meiosis. We'll see how having an extra chromosome can lead to Down Syndrome and also examine the consequences of having too few chromosomes. Disruptions to the delicate balance of cell division can have far-reaching effects. Biology 101: Intro to Biology / Science Courses.
The rights for the first four novels in the series were sold to Warner Bros. for Â£1,000,000 by J.K. Rowling. After the release of the fourth book in July 2000, the first film, Harry Potter and the Philosopher's Stone, was released on 16 November 2001.
Final Harry Potter book released. On this day in 2007, the seventh and final Harry Potter novel, Harry Potter and the Deathly Hallows, is released, with an initial print run of 12 million copies in the United States alone. Like each of the previous Harry Potter novels, Deathly Hallows was slated to be made into a major Hollywood film.