Kusiyana kwa spermatogenesis kuchokera ku oogenesis

Njira yobereka, kukula ndi kusasitsa kwa majeremusi mu biology nthawi zambiri amatchedwa "gametogenesis". Pankhaniyi, njira ya chilengedwe yomwe kukula kumachitika, ndiyeno kusasitsa kwa maselo a kugonana kwa amayi, kumatchedwa oogenesis, ndipo mwamuna ndi spermatogenesis. Ngakhale kuti ndi ofanana kwambiri, amakhala ndi kusiyana kwakukulu. Tiyeni tiyang'ane ndikuyesa kuyerekezera kwa mitundu yonseyi: oogenesis ndi spermatogenesis.

Kusiyana kwake ndi chiyani?

Kusiyana koyamba pakati pa spermatogenesis ndi ovogenesis ndikuti poonjezera pa siteji ya kubereka, kusasitsa, kukula, palinso kachigawo kachinayi. Pa nthawiyi maselo amtundu wa abambo amapanga zipangizo zoyendera, monga momwe zimakhalira, zomwe zimawathandiza kuyenda.

Chinthu chachiwirichi chikhoza kutchedwa mbali yomwe imakhala yogawanika kuchokera ku spermatocyte ya 1, maselo 4 a kugonana amapezeka nthawi yomweyo, ndipo selo imodzi yokha ya kubereka imakonzedwa kuchokera ku oocyte yoyamba, yokonzekera umuna.

Poyerekeza deta ya 2 njira (oogenesis ndi spermatogenesis), tiyeneranso kukumbukira kuti meiosis ya maselo opatsirana pogonana amadziwika ngakhale pa siteji ya chitukuko cha intrauterine, i.es. Ana amabadwa mwamsanga ndi oocytes pa dongosolo loyamba. Kukhazikika kwa iwo kumatha kokha ndi kuyamba kwa msungwana wa chiwerewere. Komabe, mwa amuna, mapangidwe a spermatozoa amapezeka mosalekeza, pa nthawi yonse ya kutha msinkhu.

Chimodzi mwa kusiyana kwa spermatogenesis ndi oogenesis ndi chizindikiro chakuti mu thupi laimuna, mpaka 30 miliyoni spermatozoa amapangidwa tsiku ndi tsiku, ndipo akazi amakula mazira 500 okha m'miyoyo yawo yonse.

Tiyeneranso kukumbukira kuti siteji ya kubereka panthawi ya spermatogenesis imachitika mosalekeza, pomwe mu oogenesis imatha nthawi yomweyo atabereka.

Kufotokozera mwachidule chikhalidwe cha oogenesis ndi spermatogenesis, ndikufuna kuti, chifukwa mapangidwe a oocyte amayamba msana kubadwa kwa msungwanayo, ndipo amatha kukwaniritsa dzira pokhapokha feteleza, zinthu zomwe zimawononga zachilengedwe zingayambitse zovuta zapachibadwa mwa mwana .