Genes are not blueprints with elaborate preset instructions for eye color, thumb size, mathematical quickness, musical sensitivity, breast cancer, etc. Instead, they are more like volume knobs and switches. Think of a giant control board inside every cell of your body. Many of those knobs and switches can be turned up/down/on/off at any time -- by another gene or by a minuscule environmental input. This flipping and turning -- called "gene expression" -- takes place constantly. It begins the moment a child is conceived and doesn't stop until she takes her last breath. Rather than giving us hardwired instructions on how a trait must be expressed, this process of gene-environment interaction drives a unique developmental path for every unique individual.
- More Here
- More Here
No comments:
Post a Comment