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).
1 Not found in Eukaryotes. 2  Coordinate gene expression in Eukaryotes depends on association of control elements with all of the genes in a dispersed group. 3  Transcription factors that recognize these control elements bind to them, promoting simultaneous transcription of the genes. The expression of a protein-coding gene is measured by the amount of functional protein a cell makes. 2  Gene expression may be blocked or stimulated by post-transcriptional steps. 3  Post-transcriptional regulatory mechanisms can fine tune gene expression and respond to changes in the environment.