Environmental changes to the DNA of clones can result in dramatically different phenotypes.

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As the website Begin Before Birth notes, we are all interested in understanding what makes us who we are, and we all want to make sure that every child gets the best possible start in life. How we turn out depends on both our genes and our environment, and the influence of the environment begins in the womb. This video highlights the dramatic effects that can result from environmental changes to DNA, as two mice with the same DNA—essentially clones—have very different appearances.

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