scientifically its called genetic memory, the bp may have never lived in the wild, however that genetic memory is still passed down. As more BPs are bread in captivity, newer generations are likely also being passed down genetic memory of captivity. This does not mean they do not still have the genetic instincts passed from previous generations which did live in the wild. There has been many more thousands of years of genetic memory of the wild than there has captive.

that being said, as stated above, its not an end all be all argument ender.