cleavage, in embryology, the thawj ob peb lub cellular faib ntawm ib zygote (fertilized qe). Thaum pib, lub zygote splits raws lub dav hlau longitudinal. Qhov thib ob faib kuj yog longitudinal, tab sis ntawm 90 degrees mus rau lub dav hlau ntawm thawj. Qhov thib peb faib yog perpendicular rau thawj ob thiab yog equatorial nyob rau hauv txoj hauj lwm.
Yuav ua li cas thaum lub sij hawm cleavage division?
Nws yog rov ua dua mitotic faib ntawm zygote uas ua rau muaj ntau lub hlwbThaum ntxov cleavage, cov xov tooj ntawm tes ob npaug nrog txhua qhov kev faib thiab txij li cov zygote tseem nyob hauv lub zona pellucida, ntau tiam neeg ntawm blastomeres ua zuj zus me me los yog compacted.
Yuav ua li cas faib tawm hauv kev sib cais?
Teb tiav: Mitosis tshwm sim thaum lub sijhawm sib cais. Cleavage koom nrog cytokinesis thiab karyokinesis (mitosis) ua ke.
Muaj pes tsawg cleavage division?
Thaum tsis muaj qhov loj ntawm cov qe, plaub hom kev sib cais lojtuaj yeem pom hauv isolecithal cells (hlwb nrog me me, txawm tias faib cov qe) lossis hauv cov hlwb mesolecithal. los yog microlecithal hlwb (nruab nrab concentration ntawm yolk nyob rau hauv ib tug gradient) – ob sab holoblastic, radial holoblastic, rotational…
Dab tsi yog qhov tseeb ntawm cov hlwb thaum lub sijhawm tawg?
Interphase nyob rau hauv cleavage division yog luv thiab tsis koom nrog kev loj hlob kom cov blastomeres ua rau me me raws li lawv cov naj npawb nce. Yog li, qhov loj ntawm cov hlwb (blastomeres) tsis nce thaum lub sij hawm cleavage.
