Source : Webster's Revised Unabridged Dictionary (1913)

Digenesis \Di*gen"e*sis\, n. [Pref. di- + genesis.] (Biol.)
   The faculty of multiplying in two ways; -- by ova fecundated
   by spermatic fluid, and asexually, as by buds. See
   {Parthenogenesis}.

Source : WordNet®

digenesis
     n : alternation of sexual and asexual generations [syn: {metagenesis}]