Shirley, It's more a question of where you paste TO than where you copied FROM that determines the format of what you're pasting. When you paste anything into the bio section, that is a text box - STRICTLY text is the only thing that is stored there, so any formatting of what you copied will be lost.
On the other hand, f you copy something from a web page and paste it into - for example - Microsoft Word then all formatting will come with it, including things like font faces/sizes/colors, and also hypertext (links will still be links and they will link to whatever they originally did).
I still agree with your guess of Wikipedia as the most likely source of the material, mainly because that's such a commonly utilized source here on WikiTree.