Qhov sib txawv tseem ceeb ntawm aster thiab spindle fibers yog tias aster fibers yog tsim nyob ib ncig ntawm lub centrioles thiab project tawm ntawm tus ncej, thaum spindle fibers tshwm sim los ntawm tus ncej mus rau qhov chaw.
Aster fibers thiab spindle fibers yog qhov tseem ceeb rau kev faib cell: mitosis thiab meiosis. Ob leeg yog cov khoom ntawm spindle apparatus. Spindle apparatus yog tsim los ntawm spindle fibers, motor proteins, thiab chromosomes. Nyob rau hauv cov tsiaj hlwb, lawv yog ua los ntawm microtubule arrays. Aster fibers thiab spindle fibers yog microtubules.
Aster Fibres yog dab tsi?
Aster fibers yog lub hnub qub zoo li cov qauv cellular uas muaj cov centrosome thiab cuam tshuam nrog microtubules thaum ntxov mitotic thiab meiotic theem hauv cov tsiaj hlwb. Aster fibers yog tsim los ntawm microtubules thiab yog ib feem ntawm cytoskeleton. Aster fibers tsis tsim nyob rau hauv cov nroj tsuag. Microtubules tsim cov Aster rays, thiab lawv tawg los ntawm centrosome. Cov fibers muab kev txhawb nqa rau cov chromosomes coj lawv mus rau qhov chaw zoo thaum lub sijhawm faib cell. Lawv pab cov chromosomes nyob rau hauv kab thiab npaj nyob rau hauv nruab nrab ntawm lub nucleus. Aster fibers rub ib nrab ntawm cov ntaub ntawv caj ces mus rau txhua sab ntawm lub nucleus thaum lub sijhawm ua haujlwm; Yog li ntawd, lub nucleus faib ua ib nrab, tawm hauv ob tug ntxhais nuclei.
Daim duab 01: Spindle Apparatus
Aster fibers pib tshwm sim thaum prophase hauv cell division. Ob lub centrosomes nrog asters tsiv mus rau sab nraud ntawm lub nucleus los tsim mitotic spindles. Yog li, aster fibers npaj cov spindle fibers, uas txuas los ntawm ob tug ncej thiab cov fibers uas txuas rau chromosomes ntawm kinetochores. Lub hnab ntawv nuclear cais mus rau hauv cov khoom tawg, thiab mitotic spindles tsim thaum pro-metaphase. Cov spindle fibers txav chromosomes mus rau qhov chaw thaum lub sij hawm metaphase. Kev taw qhia ntawm aster fibers txiav txim siab lub dav hlau ntawm kev faib cov hlwb thaum lub sij hawm faib cell.
Dab tsi yog Spindle Fibers?
Spindle fibers yog microtubules uas tsim cov mitotic thiab meiotic spindle thaum lub sijhawm cell faib. Lawv yog cov qauv protein, thiab lawv faib cov khoom siv caj ces hauv ib lub cell. Spindle fibers tseem hu ua mitotic spindles thaum lub sij hawm mitosis txij li thaum lawv tsim genetic zoo tib yam ntxhais hlwb thiab meiotic spindle thaum lub sij hawm meiosis vim nws tsim gametes nrog ib nrab ntawm cov chromosomes tshaj cov niam txiv ntawm tes. Yog li ntawd, spindle fibers yuav tsum sib npaug sib faib chromosomes rau hauv ob tug ntxhais cell los ntawm niam txiv cell thaum lub sij hawm faib cell.
Daim duab 02: Spindle Fibers hauv Mitosis
Nyob rau hauv cov txheej txheem no, spindle fibers txav chromosomes los ntawm kev txuas mus rau chromosomal caj npab thiab centromeres. Nyob rau hauv prophase, spindle fibers tsim nyob rau hauv opposite ncej ntawm lub cell, thiab thaum lub cell elongates, spindle fibers stretch. Muam chromatids txuas rau spindle fibers ntawm lawv cov kinetochore. Thaum lub sijhawm metaphase, spindle fibers hu ua polar fibers, thiab lawv txuas los ntawm cov ncej ntawm tes mus rau qhov nruab nrab. Chromosomes yog teem rau hauv nruab nrab los ntawm lub zog ntawm spindle fibers. Thaum lub sij hawm anaphase, spindle fibers luv, thiab tus muam chromatids raug rub mus rau tus ncej opposite. Thaum lub sij hawm telophase, spindle fibers disperse raws li cov chromosomes cais.
Dab tsi yog qhov zoo sib xws ntawm Aster thiab Spindle Fibres?
- Aster thiab spindle fibers yog ob hom fibers koom nrog mitosis thiab meiosis.
- Lawv yog tsim los ntawm microtubules.
- Ob lub fibers muaj nyob rau hauv cov tsiaj hlwb.
- Ntxiv mus, ob qho tib si yog cov khoom ntawm spindle apparatus.
Qhov txawv ntawm Aster thiab Spindle Fibres yog dab tsi?
Aster fibers yog ib qho txawv ntawm microtubules uas tshwm sim los ntawm centrioles. Spindle fibers tshwm sim los ntawm tus ncej mus rau qhov chaw. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm aster thiab spindle fibers. Ntxiv mus, aster fibers tsis txuas rau chromosome, thaum microtubules cais cov chromosomes rau cov ncej nrog kev pab los ntawm spindle fibers. Yog li, qhov no kuj yog qhov sib txawv ntawm aster thiab spindle fibers. Tsis tas li ntawd, aster fibers tsuas pom nyob rau hauv cov tsiaj hlwb, thaum spindle fibers pom nyob rau hauv cov nroj tsuag thiab tsiaj hlwb.
Cov hauv qab no infographic nthuav tawm qhov sib txawv ntawm aster thiab spindle fibers hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Aster vs Spindle Fibres
Aster fibers thiab spindle fibers yog qhov tseem ceeb rau kev faib cell. Lawv yog cov khoom ntawm spindle apparatus. Ob lub fibers yog tsim los ntawm microtubules. Aster fibers yog tsim nyob ze centrioles thiab radiate ntawm tus ncej, thaum spindle fibers tshwm sim los ntawm tus ncej mus rau qhov chaw. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm aster thiab spindle fibers. Aster fibers yog lub hnub qub-zoo li cellular qauv uas muaj ib tug centrosome thiab txuam nrog microtubules thaum ntxov mitotic thiab meiotic theem. Spindle fibers yog microtubules uas tsim cov mitotic thiab meiotic spindle thaum lub sij hawm cell division.
