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Gastrulaning tashqi qavati ektoderma, ichki qavati entoderma deb ataladi. Ektoderma va entoderma homila varaqalari, gastrula ichidagi bo‘shliq birlamchi ichak deb ataladi. U tashqariga birlamchi og‘iz orqali ochiladi. Keyinchalik ektoderma bilan entodermaning o‘rtasida mezoderma rivojlanadi. G‘ovak tanlilar va kovakichlilardagina mezoderma hosil bo‘lmaydi. Shunday qilib, gastrulatsiya jarayonida uchta homila qavati hosil bo‘ladi. Homila qavatlari nisbatan bir xil bo‘lgan blastula hujayralarining ixtisoslashishi natijasida hosil bo‘ladi.
Gastrulatsiya, Organogenez, Homila, Ektoderma
Gastrulatsiya, Organogenez, Homila, Ektoderma
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