NCTIII.4 distinguished genes (familial, almost indelible traits) from traits (personal,reversible features). NCT III.6 formulated the law of the absurdity cascade, where fracturebecomes a source of regeneration. The present NCT III.7 answers the question: wheredo genes and traits come from?We propose that genes and traits are crystallizations of a plural memory Mp (aggregation of experiences, crossed thresholds, conserved traces). The law of morphologicalgenesis writes:Mp crystallization−−−−−−−−→ G expressio−−−−−−→ C projection−−−−−−→ Φwhere Mp is plural memory, G genes (crystallized invariants), C traits (functionalexpressions), and Φ morphology (visible form). Each arrow is a canonical transformation:fixation by recurrence, functional expression, morphological projection.This law unifies NCT II.4 (active entropy, spectral shield), NCT III.4 (genes, traits),NCT III.5 (atomic signatures), NCT III.6 (absurdity cascade). It shows that visible formis crystallized memory.Keywords: M²FA, law of morphological genesis, plural memory Mp, genes G, traits C,morphology Φ, crystallization.