Video: Dab tsi ntawm chromosomes ua cov spindle fibers txuas rau txhawm rau txav cov chromosomes ncig?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Thaum kawg, cov microtubules txuas los ntawm centrioles ntawm cov ncej ntawm lub cell txuas mus rau txhua lub centromere thiab txhim kho mus rau hauv spindle fibers . Los ntawm kev loj hlob ntawm ib kawg thiab shrinking ntawm lwm yam, spindle fibers align cov chromosomes nyob rau hauv nruab nrab ntawm lub cell nucleus, kwv yees li equidistant los ntawm lub spindle ncej.
Tsis tas li ntawd, dab tsi ntawm chromosome ua cov spindle fibers txuas rau?
Microtubules hu ua spindle fibers pib ncua los ntawm centrosomes thiab pib mus txuas rau cov kinetochores ntawm lub chromosomes , uas yog nyob rau hauv centromeres (centers) ntawm lub chromosomes.
Qhov thib ob, spindle fibers txav chromosomes li cas? Spindle fibers txav chromosomes thaum sib faib cell los ntawm kev txuas mus chromosome caj npab thiab centromeres. Lub centromere yog ib cheeb tsam tshwj xeeb ntawm a chromosome qhov twg duplicates yog txuas. Zoo tib yam, koom cov ntawv luam ntawm ib leeg chromosome yog hu ua muam chromatids.
Tom qab ntawd, ib tug kuj yuav nug, dab tsi theem chromosomes txav raws spindle fibers?
kev anaphase
Cov qauv uas tuav cov chromatids ua ke yog dab tsi?
centromeres. … uas tuav ua ke ob tug chromatids (tus ntxhais strands ntawm replicated chromosome). Lub centromere yog lub ntsiab lus txuas ntawm lub kinetochore, a qauv uas cov microtubules ntawm lub mitotic spindle ua anchored.
Pom zoo:
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