> Information Center > FAQs > Do all human genomes have the same number of base pairs?
The human genome is mostly the same in all people. But there are variations across the genome. This genetic variation accounts for about 0.001 percent of each person's DNA and contributes to differences in appearance and health. People who are closely related have more similar DNA.
Some of the variations between individuals result from epigenetic changes. These changes arise from chemical tags that attach to DNA and affect how cells read DNA’s instructions.
Epigenetic changes can be inherited.
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