Sam HarrisWhat are the chances that we will one day discover that DNA has absolutely nothing to do with inheritance? They are effectively zero.
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We are fortunate that DNA is not the sole factor in inheritance, since this would mean that people could be genetically related without any physical relationship. Nevertheless, the likelihood of this occurring remains small because it would require many simultaneous changes to occur simultaneously in thousands of different genes. What happens if one gene is mutated? The organism might live but it would exhibit all kinds of unusual traits that are not "well-suited" for survival. If this happened in every kind of animal, the population would be wiped out because many other traits would become more important than standard survival.
Source: The End Of Faith: Religion, Terror, And The Future Of Reason
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