That’s a pretty complex question actually and theoretically identical twins share 100% of their DNA and any two random humans share about 99.9% of their DNA. That’s the part of the DNA that codes for GENES anyway – which is only about 2% of the genome! The rest of the genome is made up of DNA that helps control gene expression, helps the chromosome maintain its structure, and a large proportion of that DNA is still a mystery!
BUT… there are so many genes in the genome that even less than 1% variation can affect a lot of genes. ALSO your environment will affect your ‘epi’genetics which is a critical part of how your genes are read by the cell. So, even if the DNA code is 100% identical, if the epigenetics is different then the person can look and act competely different too.
awesomekid
Hi awesomekid,
That’s a pretty complex question actually and theoretically identical twins share 100% of their DNA and any two random humans share about 99.9% of their DNA. That’s the part of the DNA that codes for GENES anyway – which is only about 2% of the genome! The rest of the genome is made up of DNA that helps control gene expression, helps the chromosome maintain its structure, and a large proportion of that DNA is still a mystery!
BUT… there are so many genes in the genome that even less than 1% variation can affect a lot of genes. ALSO your environment will affect your ‘epi’genetics which is a critical part of how your genes are read by the cell. So, even if the DNA code is 100% identical, if the epigenetics is different then the person can look and act competely different too.
Hope this helps!
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