A loss of smell or taste can be frustrating. But in most cases, this impairment is only temporary with a complete loss of the two important senses being rare. Smell impairment can be partial or total. A temporary loss of smell results from nasal congestion, allergic rhinitis, colds and other nasal allergies. When the nasal passage is blocked, it hinders the sense of smell and taste as these are related functions. Nasal tumors, polyps and septal deformities also prevent air flow to the region consisting of smell receptors. With age, the sense of smell can be affected to a degree.
A gene mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people.
How Do Genetic Mutations Occur. 03 May, 2011 how do 0. A mutation is a permanent change in the DNA sequence of a gene. Genetic mutations are those that are passed on from a parent to a child and through families or are acquired during a personâs lifetime. If it is a hereditary mutation the damage to the cell in the parent is passed on through their DNA to their child.