Video: Cleavage yog dab tsi thiab thaum twg nws tshwm sim?
2024 Tus sau: Edward Hancock | [email protected]. Kawg hloov kho: 2023-12-16 01:32
Cleavage. Cov zygote ua siv ob peb hnub tom ntej no taug kev hauv lub raj Fallopian. Thaum nws mus, nws faib los ntawm mitosis ob peb zaug los tsim ib lub pob ntawm cov hlwb hu ua morula. Kev faib tawm ntawm tes, uas yog hu ua cleavage, nce cov cell tab sis tsis yog lawv qhov loj me.
Ib yam li ntawd, tib neeg nug, hom cleavage tshwm sim hauv tib neeg li cas?
Cleavage hauv tib neeg zygote ua Cleavage hauv tib neeg zygote ua tshwm sim Thaum lub sij hawm nws txoj kev los ntawm txoj hlab ntsha fallopian mus rau lub tsev me nyuam raws li nyob rau hauv lwm yam tsiaj. Nws yog holoblastic. Thawj cleavage tshwm sim txog 30 teev tom qab fertilization. Nws yog meridional, coinciding nrog tus tsiaj-tsob ntoo ncej axis.
Tsis tas li ntawd, dab tsi yog cleavage thiab nws hom? Cleavage Cov Qauv Thiab Morphogenesis. Hauv cov kab mob uas tsim cov qe nrog me ntsis yolk, lub zygote faib los ntawm holoblastic cleavage . Nyob rau hauv xws li cleavages, tag nrho cov cell muab faib sib npaug. Plaub loj holoblastic hom cleavage tuaj yeem pom dav dav: radial, kauv, ob sab, thiab rotational.
Tom qab ntawd, ib tug kuj yuav nug, dab tsi yog qhov cleavage theem?
Hauv embryology, cleavage yog kev faib cov hlwb nyob rau hauv lub embryo thaum ntxov. Lub zygotes ntawm ntau hom tau dhau los ua lub voj voog ntawm tes nrawm uas tsis muaj kev loj hlob tag nrho, tsim ib pawg ntawm cov hlwb tib yam li qub zygote.
Qhov twg cleavage tshwm sim?
Tsuas yog tshiab chromatin (cov khoom siv nuclear) yog synthesized ntawm kev faib, thiab qhov no siv qhov chaw ntawm tus nqi ntawm cytoplasm (cov khoom ntawm lub cell sab nraum lub nucleus). Cov qauv ntawm cleavage nws txawv ntawm pawg tsiaj tab sis yog tus qauv zoo heev rau txhua tus neeg hauv ib hom tsiaj.
Pom zoo:
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Kab lis kev cai poob siab yog ib qho kev paub uas ib tug neeg yuav muaj thaum ib tug txav mus rau ib puag ncig kev coj noj coj ua uas txawv ntawm nws tus kheej; Nws kuj yog qhov kev tsis sib haum xeeb ntawm tus kheej ib tus neeg yuav xav tias thaum ntsib txoj kev tsis paub ntawm lub neej vim kev nkag tebchaws lossis mus ntsib lub tebchaws tshiab, kev txav mus los ntawm ib puag ncig kev sib raug zoo, lossis yooj yim