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.
Running the Gamut. Multiple genes and, therefore, multiple alleles, affect continuous, or quantitative, traits. Because they are caused by more than one gene, they are also referred to as polygenic traits. Gene expression is complex, and continuous traits can also be influenced by environmental factors. Continuous traits are common in humans, who show a wide range of possibilities in characteristics such as height, skin color, learning ability and blood pressure.