In Animals Gametogenesis

1 in animals

1.1 stages

1.1.1 common path
1.1.2 individual path


1.2 in vitro gametogenesis

in animals

scheme showing analogies in process of maturation of ovum , development of spermatids, following individual pathways. oocytes , spermatocytes both gametocytes. ova , spermatids complete gametes. in reality, first polar body typically dies without dividing.

animals produce gametes directly through meiosis in organs called gonads (testicles in males , ovaries in females). males , females of species reproduces sexually have different forms of gametogenesis

spermatogenesis (male)
oogenesis (female)

stages

however, before turning gametogonia, embryonic development of gametes same in males , females.

common path

gametogonia seen initial stage of gametogenesis. however, gametogonia successors of [[primoweranonymousment, primordial germ cells (pgcs) dorsal endoderm of yolk sac migrate along hindgut gonadal ridge. multiply mitosis, and, once have reached gonadal ridge in late embryonic stage, referred gametogonia. once germ cells have developed gametogonia, no longer same between males , females.

individual path

from gametogonia, male , female gametes develop differently - males spermatogenesis , females oogenesis. however, convention, following pattern common both:

in vitro gametogenesis

in vitro gametogenesis (ivg) technique of developing in vitro generated gametes, i.e., generation of eggs , sperm pluripotent stem cells in culture dish. technique feasible in mice , have future success in humans , nonhuman primates.

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