PHP â Sort Functions For Arrays. In this chapter, we will go through the following PHP array sort functions: sort() â sort arrays in ascending order. rsort() â sort arrays in descending order. asort() â sort associative arrays in ascending order, according to the value.
Environmental factors that can affect gene expression. Exposing a fetus, infant, or child to a chemical or nutritional (or other) stressor during development can affect the risk of disease development even into adulthood. The mechanisms involved are probably epigenetics (Boekelheide et al. 2012).
It is also important to remember that genes are not a steadfast blueprint for heredity. Genes are actually quite active throughout our lives, switching their expression on and off in response to the environment and experience. Environmental factors can affect and alter gene expression, while our genes can define how we respond to different environments.