Qhov Tseem Ceeb Qhov txawv - Radial vs Kauv Cleavage
Cleavage tuaj yeem yog ob pawg uas nyob ntawm qhov ntau ntawm cov qe hauv qe. Ob hom no yog holoblastic (tag nrho) cleavage los yog meroblastic (ib nrab) cleavage. Radial thiab Kauv cleavage ob hom holoblastic cleavage. Radial cleavage muaj nyob rau hauv deuterostomes thaum muab kauv cleavage nyob rau hauv protostomes. Qhov no yog qhov sib txawv tseem ceeb ntawm radial thiab kauv cleavage.
Nyob rau hauv cov ntsiab lus ntawm embryology, cleavage yog txhais raws li kev faib cov hlwb thaum ntxov embryo txoj kev loj hlob. Qhov no yog ua raws li cov txheej txheem fertilization, qhov kev hloov pauv no tau yooj yim thiab tshwm sim los ntawm kev ua kom muaj cyclin-dependent kinase complex.
Radial Cleavage yog dab tsi?
Radial cleavage txhais tau tias yog hom kev sib cais uas muaj nyob rau hauv deuterostomes, uas yog tus cwj pwm los ntawm kev npaj ntawm blastomeres. Lawv tau teem caij rau hauv ib txoj hauj lwm uas blastomeres ntawm txhua qib siab yog ncaj qha rau ntawm cov qib qis tom ntej. Deuterostomes uas qhia radial cleavage muaj xws li ib co vertebrates thiab echinoderms.
Daim duab 01: Radial Cleavage
Qhov kev npaj no ua rau muaj qhov sib luag ntawm qhov sib npaug uas muaj nyob ib puag ncig ntawm tus ncej rau tus ncej ntawm lub embryo. Hauv lwm cov ntsiab lus, qhov kev npaj no tuaj yeem piav qhia raws li kev npaj qhov twg cov spindle axes nyob rau hauv parallel los yog tam sim no ntawm txoj cai kaum rau lub polar axis ntawm lub oocyte.
Kauv Cleavage yog dab tsi?
Kauv cleavage txhais tau tias yog hom cleavage uas feem ntau muaj nyob rau hauv protostomes. Zoo ib yam li radial cleavage nyob rau hauv deuterostomes, kauv cleavage kuj yog tshwm sim los ntawm lub xub ntiag ntawm txawv tshwj xeeb nta. Nws yog qhov tshwj xeeb ntawm kev teeb tsa ntawm blastomeres ntawm txhua theem sab saud ntawm cov xovtooj ntawm tes uas muaj nyob rau hauv qis qis, ua rau ua rau cov blastomeres teem ib ncig ntawm tus ncej rau ncej axis ntawm lub embryo.
Daim duab 02: Kauv Cleavage
Feem ntau ntawm cov tsiaj uas tsim hom kauv cleavage no hu ua spiralians uas suav nrog taxa lophotrochozoa. Nws tau hais tias feem ntau ntawm cov spiralians tau txais kev sib npaug ntawm cov kauv cleavage whilst qee tus ntawm lawv tsis muaj qhov sib npaug ntawm cov kauv cleavage.
Dab tsi zoo sib xws ntawm Radial thiab Kauv Cleavage?
- Ob Radial thiab Kauv Cleavage yog holoblastic cleavages.
- Ob leeg tshwm sim hauv theem embryonic.
- Blastomeres koom nrog hauv Radial thiab Kauv Cleavage.
- Blastomeres tau npaj ua ob theem; tier sab sauv thiab qis dua nyob rau hauv ob qho tib si cleavages.
Qhov txawv ntawm Radial thiab Kauv Cleavage yog dab tsi?
Radial vs Kauv Cleavage |
|
| Radical Cleavage txhais tau tias yog ib hom kev sib cais hauv qhov kev loj hlob embryo qhov kev faib cell tshwm sim ntawm kaum sab xis mus rau yav dhau los faib, ua rau plaub blastomeres nyob ncaj qha saum plaub lwm tus. | Kauv cleavage txhais tau tias yog ib hom cleavage qhov kev faib ntawm cov hlwb nyob rau hauv lub embryo tsim tshwm sim nyob rau hauv ib tug kauv. |
| qeb | |
| Radial cleavage muaj nyob rau hauv deuterostomes | Kauv cleavage muaj nyob rau hauv protostomes |
| Cell Junction | |
| Tsis muaj kev koom tes ntawm cov xovtooj ntawm tes hauv radial cleavage. | Kev npaj ntawm cov blastomeres ntawm txhua qib siab tshaj ntawm cov xovtooj ntawm tes tshwm sim hauv kev sib cais. |
| Piv txwv | |
| Echinoderms thiab qee cov vertebrates qhia radial cleavage. | Taxon lophotrochozoa qhia kauv cleavage. |
| Subtypes of Cleavage | |
| Tsis muaj qhov sib txawv ntawm cov radial cleavage tam sim no. | Ib nrab thiab sib npaug ntawm kauv cleavages yog subtypes ntawm kauv cleavage. |
Summary – Radial vs Spiral Cleavage
Cleavage txhais tau tias yog kev faib cov hlwb thaum ntxov embryo kev loj hlob. Cleavage tuaj yeem yog ob pawg; holoblastic thiab meroblastic. Radial cleavage thiab kauv cleavage yog ob feem ntawm holoblastic cleavage. Radial cleavage muaj nyob rau hauv deuterostomes thaum muab kauv cleavage nyob rau hauv protostomes. Nyob rau hauv radial cleavage, tus tsim embryo faib txoj cai kaum rau yav dhau los faib, ua rau plaub blastomeres nyob ncaj qha saum plaub lwm tus. Nyob rau hauv kauv cleavage, kev faib ntawm cov hlwb nyob rau hauv lub tsim embryo tshwm sim nyob rau hauv ib tug kauv. Qhov no yog qhov txawv ntawm radial thiab kauv cleavage.
