In the beginning of the human race there was no genetic load which would cause undesirable traits such as appear in offspring of marriages between relatives today. ↗
With our knowledge of modern-day genetics, we realize that it was possible for God to place the potential for all people throughout history into the genes of Adam and Eve when He created them. ↗
But, when Scripture makes a clear distinction between the act of creation and the process of preservation, we cannot accept the idea of a progressive creation process. ↗