Puas yog tag nrho cov zygote ntawm cov ntses hnub qub koom nrog hauv kev tawg thaum ntxov?
Puas yog tag nrho cov zygote ntawm cov ntses hnub qub koom nrog hauv kev tawg thaum ntxov?

Video: Puas yog tag nrho cov zygote ntawm cov ntses hnub qub koom nrog hauv kev tawg thaum ntxov?

Video: Puas yog tag nrho cov zygote ntawm cov ntses hnub qub koom nrog hauv kev tawg thaum ntxov?
Video: Khaws kev nyuaj siab mus qhia tswv ntuj | Nkauj ntseeg tawm tshiab 2024, Kaum ib hlis
Anonim

Yog, lub tag nrho zygote yog koom nrog hauv cleavage . Ob leeg holoblastic thiab meroblastic cleavages ua rau blastula. Cov kab noj hniav nyob rau hauv lub blastula yog hu ua blastocoel, thiab nws txheej txheej ntawm tes yog hu ua blastoderm.

Yog li ntawd, hom cleavage pom nyob rau hauv Hiav Txwv Star?

holoblastic

Tom qab, lo lus nug yog, dab tsi yog lub luag hauj lwm ntawm cleavage nyob rau hauv thaum ntxov embryo? Hauv embryology, cleavage yog kev faib cov cell hauv lub thaum ntxov embryo . Cleavage txawv ntawm lwm hom kev faib ntawm tes nyob rau hauv uas nws ua rau kom cov xov tooj ntawm tes thiab nuclear loj yam tsis tau nce lub cytoplasmic loj.

Dab tsi yog txoj hmoo ntawm Blastopore rau cov ntses hnub qub?

Cov blastopore yog yav tom ntej anus ntawm lub ntses hnub qub . Nyob rau hauv ib tug gastrula lub hlwb nyob rau sab nraud yog ectoderm, cov hauv ob sab phlu hauv lub raj yog endoderm, thiab cov hlwb uas migrate thiab multiply ntawm cov khaubncaws sab nraud povtseg yuav ua lub mesoderm.

Dab tsi yog qhov txheej txheem ntawm cleavage?

Tom qab fertilization, kev loj hlob ntawm ib tug multicellular kab mob tshwm sim los ntawm a txheej txheem hu ua cleavage , ib tug series ntawm mitotic divisions uas lub enormous ntim ntawm qe cytoplasm muab faib mus rau hauv ntau me me, nucleated hlwb. Cov no cleavage -stage cells hu ua blastomeres.

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