on·tog·e·ny 
(ŏn-tŏjə-nē)
(ŏn-tŏjə-nē)n. pl. on·tog·e·nies
The development of an individual organism or a part of an organism from inception to maturity. Also called ontogenesis.
on′to·ge·netic (ŏn′tə-jə-nĕtĭk), on′to·genic (-jĕnĭk) adj.
on′to·ge·neti·cal·ly, on′to·geni·cal·ly adv.