Not all the useful DNA in your chromosomes comes from your ancestors some of it was borrowed from elsewhere.
Surprisingly, not all of the useful DNA in your chromosomes comes from your evolutionary ancestors; some was borrowed from somewhere else. At least eight retrovirus genes have been found in your DNA. This is a virus that takes over a cell by exploiting the cell's DNA coding mechanisms. These genes were eventually incorporated into human DNA at some point in history. These viral genes in DNA now play critical roles in human reproduction, despite the fact that they are completely foreign to our genetic ancestors.
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