Genetics and the Lack of True Grit

Documentation passed down from the past
says that since time primordial, folks have been cast
from the genes of their ancestors, first unto last.
Thus, my nose is too long and my forehead is vast.
It’s a truth of genetics that leaves me aghast!
(Yes, I’d alter those features if only I dast,)

Prompt words for today are forehead, genetic, primordial, document and vast,
 Image by Milada Vigerova on Unsplash.