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.
Qi is in a state of continuous flux, transforming endlessly from one aspect of Qi into another. It is neither created nor is it ever destroyed; it simply changes in its manifestation. In order to talk about the relationships between the various aspects and manifestations of Qi within a given context, Chinese philosophy employs the concept of yin and yang.