environmental conditions effects on phenotypes
temperature, diet, light, humidity, and the presence of toxins
Epigenetics
the study of heritable phenotype changes that do not involve alterations in the DNA nucleotide sequence.
things affecting DNA
diet, financial troubles, exercise, social contact, state of your gut and mind, circadian rhythms, health and medication
Molecular tags
The most well known epigenetic mechanisms are methylation and acetylation of histones and methylation of DNA. These epigenetic markers act as tags which tell the cell to increase or decrease gene transcription therefore gene expression