Polyploidy is the condition in which an organism has extra sets of chromosomes. It can be defined as a chromosomal alteration in which the organism posses more than two complete chromosome sets. Classified as an accident in cell division. Polyploidy is the condition in which an organism has extra sets of chromosomes.
Dubuque [1], founded in 1833, is the oldest city in Iowa. A port on the upper Mississippi River, it is situated along scenic bluffs facing the river, and has its roots in a mining and trading settlement established in the area by Quebec-born entrepreneur Julien Dubuque in 1788.
The World's First City. http://en.wikipedia.org/wiki/Eridu in Iraq (part of Mesopotamia civilization) is also claimed to be the oldest city (dating to 5000 BC). Both the definition of a city and the age of many cities is still disputed.