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.
It was published worldwide in English on 21 June 2003. Harry Potter and the Half-Blood Prince was published on 16 July 2005, and it sold 9 million copies in the first 24 hours of its worldwide release. The seventh and final novel, Harry Potter and the Deathly Hallows, was published on 21 July 2007.