Lub sijhawm prophase , lub nucleus ploj mus, spindle fibers daim ntawv, thiab DNA condenses rau hauv chromosomes (tus muam chromatids viv ncaus chromatids Ib tus muam chromatid yog hais txog cov ntawv luam zoo tib yam (chromatids) tsim los ntawm DNA replication ntawm ib chromosome, nrog ob daim ntawv luam ua ke los ntawm ib tug centromere. https://en.wikipedia.org › wiki › Sister_chromatids
Sister chromatids - Wikipedia
). Thaum lub sij hawm metaphase, tus viv ncaus chromatids ua raws txoj kab nruab nrab ntawm lub cell los ntawm kev txuas lawv cov centromeres rau cov spindle fibers.
theem twg ntawm mitosis ua cov spindles?
Lub mitotic spindle kuj pib tsim thaum lub sij hawm prophase. Raws li lub xovtooj ntawm ob lub centrosomes txav mus rau cov ncej, microtubules maj mam sib sau ua ke ntawm lawv, tsim lub network uas tom qab ntawd yuav rub cov chromosomes sib npaug sib nrug.
spindles daim ntawv nyob qhov twg?
Thaum pib ntawm kev faib tawm nuclear, ob lub log-zoo li tus qauv protein hu ua centrioles tso lawv tus kheej ntawm qhov kawg ntawm lub xovtooj tsim cell ncej Ntev protein fibers hu ua microtubules txuas los ntawm centrioles nyob rau hauv tag nrho cov kev taw qhia ua tau, tsim qhov hu ua spindle.
theem twg ua centrioles thiab spindles pib tsim?
Prophase yog thawj theem ntawm mitosis, lub sijhawm uas lub cell pib tso nws tus kheej txhawm rau cais cov chromatids thiab faib. Thaum lub sij hawm prophase, lub hnab ntawv nuclear thiab nucleolus yog yaj thiab cov chromosomes condense. Cov centrioles thiab spindle fibers pib tsim ntawm opposite ncej ntawm lub cell.
Dab tsi ua rau spindle tsim?
Kev teeb tsa lub tshuab spindle
Nyob rau hauv centrosome-mediated "nrhiav thiab ntes" qauv (sab laug), microtubules nucleated los ntawm centrosomes hu chromosomes los ntawm lub caij nyoog thiab ua kom ruaj khov ntawm kinetochores los ua tus spindle.
