1 Down syndrome, usually is caused by an extra copy of chromosome 21 (trisomy 21). Characteristics include decreased muscle tone, asymmetrical skull, slanting eyes and mild to moderate mental retardation.  Edward's syndrome, which is the second most common trisomy after Down syndrome. It is a trisomy of chromosome 18.
Guanxi describes the basic dynamic in personalized networks of influence, and is a central idea in Chinese society.
China is a country full of might, great wonders and important inventions. Its history was formed by different dynasties throughout history. One of the most effective and popular dynastyâs in China was the Qin Dynasty. Qin is pronounced as chin and it is the reason why the western name for the country became China. Previous to its rise in popularity, Qin was just a small state located in the northwest of China.