1 the set of exogenic (physical, chemical and biological) processes that alter the physical and chemical state of rocks at or near the earth's surface.  intensity of most weathering decreases with depth, because variations in temperature and moistures decrease with depth.
A gene is a segment of nucleic acid that contains the information necessary to produce a functional product, usually a protein. Genes consist of a long strand of DNA (RNA in some viruses) that contains a promoter, which controls the activity of a gene, and a coding sequence, which determines what the gene produces.
The information for assembling a protein is carried in our DNA. The section of DNA that contains the code for making a protein is called a gene. There may be up to 100,000 genes in the human genome. Each gene codes for a unique protein: one gene, one protein.