The covalent modification of histones that is not known to play a role in regulation of gene expression is
metabolic engineering and inheritance analysis shows exogenous gene introduction and pathway extension enable trait improvement. Consequently glycosylation emerges as the valid choice since it demonstrates metabolic extension and combinatorial biosynthesis, aligning with established principles in genetics and biotechnology literature.
Ref: Griffiths et al., Introduction to Genetic Analysis, 11th Edition, Chapter 5, discusses metabolic pathways, recombinant DNA technology, metabolic extension and Golden Rice as pathway engineering for vitamin A production.
