Spermatogenesis ndi oogenesis

Spermatogenesis ndi oogenesis ndi njira zomwe mapangidwe, kukula, ndi kusasitsa kwa maselo amtundu wa amuna ndi akazi amapezeka, motero. Zozizwitsa zonse ziwirizi zimakhala zofanana zambiri. Koma, ngakhale izi, pali kusiyana. Tiyeni tiwone bwinobwino zomwe zimachitika pa spermatogenesis ndi oogenesis ndikuziimira.

Kodi kufanana kwa oogenesis ndi spermatogenesis ndi chiyani?

Choyamba, tiyenera kukumbukira kuti zonse zolemba deta zili ndi magawo omwewo. Taganizirani izi:

1. Gawo la kubalana. Panthawi imeneyi, maselo akuluakulu a spermatogonia ndi oogonia amayamba kugawikana ndi mitosis. Izi ziyenera kuzindikirika mbali iyi pa gawo ili: Mwa abambo, kubereka kwa maselo opatsirana pogonana kumachitika m'moyo wonse (kuyambira pa msinkhu wa kukula ), ndipo mwa amai gawo ili likufika pa siteji ya chitukuko cha embryonic (miyezi 2-5 yakukula kwa mwana).
2. Gawo la kukula. Pali kuwonjezeka kwakukulu kwa maselo a kugonana mu kukula. Zotsatira zake, zimatembenukira ku spermatocytes ndi oocytes pa dongosolo loyamba. Pankhaniyi, ma oocyte ndi aakulu kwambiri chifukwa amadzipezera zakudya zambiri zofunika kuti chitukukocho chikhale chitsikuko pambuyo pa umuna wa oocyte.
3. Gawo la kusasitsa. Odziwika ndi ndime ya meiosis 1 ndi meiosis 2. Chifukwa cha magawo oyambirira, spermatocytes ndi oocytes amapanga maulamulo awiri, ndipo pambuyo pachiwiri - mazira okhwima ndi spermatids. Ndikofunika kunena kuti spermatocyte yokha ya magawo awiri pambuyo pogawidwa amapereka 4 spermatids, ndipo kuchokera ku oocyte ya 1 yokha dzira limodzi lokha ndi ma corpuscle atatu omwe amapangidwa.

Kodi kusiyana kotani ndi oogenesis ndi spermatogenesis?

Pochita zofanana za oogenesis ndi spermatogenesis, m'pofunika kunena kuti kusiyana kwakukulu kwa njirazi ndi kupezeka kwa ovogenesis pa magawo anayi a mapangidwe. Ndizitsamba zokha zomwe zimayambira kusintha mu spermatozoa. Mapangidwe a maselo ogonanawa amayamba pokhapokha pa kuyamba msinkhu mwa anyamata.

Malamulo onse apamwamba a spermatogenesis ndi oogenesis ali ndi matanthauzo awo. Mwachitsanzo, kusiyana kwa maselo opatsirana pogonana pa oogenesis kumalimbikitsa kupanga dzira limodzi lokha lokhala ndi zakudya zambiri.

Komanso, kuti spermatozoa imapangidwanso kwambiri chifukwa chakuti dzira limatulutsidwa, mchenga wamwamuna mmodzi wokha wa kugonana umafikira. Ena onse amafa panjira yopita kukazi ovomerezeka.

Timakupatsani chithunzithunzi chakumvetsetsa bwino njira za spermatogenesis ndi oogenesis, momwe mfundo zazikulu za aliyense wa iwo zikuwonetsedwa.