Environmental factors affect DNA as they can alter the DNA sequence of a gene Because they have the potential to alter epigenetic regulation.
Changing the structure of proteins that DNA wraps around or changing how molecules bind to DNA in response to environmental factors like food, drugs, or exposure to toxins can cause epigenetic changes. Occasionally, the environment can alter a gene's activity level or DNA sequence. Either of these effects can alter the proteins of a gene, which in turn affects traits. The sequence of nucleotides can be modified by a few harmful environmental factors. UV light, for instance, can damage DNA strands.
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