pedigree-book-keeping

Updated: May 18, 2025

Hence pedigree-book-keeping must become the general rule. Subordinate to this are two further points, which should likewise be stated here. One pertains to the pure or hybrid nature of the original strain, and the other to the life-conditions and all other external influences. It is manifest that a complete understanding of a mutation depends upon full information upon these points.

Hugo de Vries - Species and Varieties, Their Origin by Mutation