The income per capita in Phoenix is 16% lower than the national average. The median household income in Phoenix is 12% lower than the national average. Male median earnings are 41% higher than female median earnings. The unemployment rate in Phoenix is 11% higher than the national average. The poverty level in Phoenix is 49% higher than the national average.
One major internal environmental influence that affects gene expression is gender, as is the case with sex-influenced and sex-limited traits. Similarly, drugs, chemicals, temperature, and light are among the external environmental factors that can determine which genes are turned on and off, thereby influencing the way an organism develops and functions.
The intracellular environment can be changed by the mutation of other genes, which may then modify the action of a gene under study. Gene interaction is thus seen to be in part an aspect of the study of the internal environment of the cell.ee Genetic code. If there is no noticeable effect of mutation on a protein's action in forming the phenotype, the mutant allele may be called a neutral allele. However, even a single amino acid substitution may cause a protein to be completely inactive and, if the protein is an enzyme, create a genetic metabolic block.