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).
Of course, higher eukaryotes still respond to environmental signals by regulating their genes. But there is an additional layer of regulation that results from cell-to-cell interactions within the organism that orchestrate development. Specifically, gene expression is controlled on two levels.truhl, K. Fundamentally different logic of gene regulation in eukaryotes and prokaryotes. Cell 98, 1â4 (1999). Sproul, D., Gilbert, N., & Bickmore, W. The role of chromatin structure in regulating the expression of clustered genes.