The Hardy-Weinberg principle is not generally found in nature because it requires certain conditions in an environment. These conditions are the absence of the things that can cause evolution. In other words, if no mechanisms of evolution are acting on a population, evolution will not occur--the gene pool frequencies will remain unchanged.
Some pregnant women experience a metallic taste in their mouth during the early stages of pregnancy, because of the hormone changes. It's also fairly common to crave certain foods, or go off certain foods, and have a heightened sense of smell.
Related Questions. 1  metallic taste w acid reflux/. 2  My lips inside become red swollen and metal taste in mouth when I get around scents been to four dr they dont know what is causing it Just started in july. 3  I have an unbearable metallic taste in my mouth.  metalic taste on 1  coughing. Achiness, trouble sleeping, pains in stomach.