One of the basic tenets of Bhuddism, is that "conciousness is an intrinsic part of the cosmos". On a level we don't understand, I believe conciousness can control how our genes function.....turning things on/off as needed.

Trying to refrain from all the jokes about ....conciousness controlling...how our 'jeans' function....turning things on/off -from back in high school...

I'd propose that when the Creator made "All the beasts of the field", then this would suggest that the chicken was created first, & the egg is meerly the means but which they can sustain the species.