  In this paper we introduce the notion of $\zeta$-crossbreeding in a set of
$\zeta$-factorization formulas and also the notion of complete hybrid formula
as the final result of that crossbreeding. The last formula is used as a
criterion for selection of families of $\zeta$-kindred elements in class of
real continuous functions.
  Dedicated to recalling of Gregory Mendel's pea-crossbreeding.
