Raws li tshiab hlwb yog tsim los ntawm mitosis: nta thiab txheej txheem nqi

Ib tug ntawm cov ntsiab lus ntawm lub npe nrov cell tshawb xav ntawm tus qauv ntawm ib daim ntawv qhia txog cov tsos ntawm cov hlwb tshiab ntawm qhov chaw, xws li cov niam txiv. Tab sis nws yuav tshwm sim nyob rau hauv ob txoj kev. Ib tug ntawm lawv yog mitosis. Nws yog qhov tseem ceeb rau cov txheej txheem ntawm tu tub tu kiv ntawm lawv tus kheej zoo. Uas hlwb yog tsim los ntawm mitosis, dab tsi yog lawv tus xov tooj thiab cov yam ntxwv ntawm tus txheej txheem - tag nrho cov no yuav tsum tau tham nyob rau hauv kom meej nyob rau hauv no tsab xov xwm.

cell voj voog

Lub cell ntawm tej kab mob muaj peev xwm uas twb muaj lawm nyob rau hauv cov kis ntawm ob ntawm nws cov crushing los yog los ntawm thaum pib ntawm tus txheej txheem mus txog rau lub sij hawm ntawm txoj kev tuag. Kauj ruam no yog lub sij hawm thiab lub cell voj voog. Nws comprises cov kauj ruam ntawm faib thiab tej lub sij hawm caij nyoog nruab nrab lawv, uas yog hu ua interphase. Nyob rau hauv lub sij hawm no lub cell loj hlob thiab tsim cov as-ham.

Tab sis ib yam ntawm cov feem ntau yam tseem ceeb yog cov txheej txheem ntawm doubling DNA macromolecules. Muaj yog encrypted tag nrho cov kev tshuaj ntsuam genetic cov ntaub ntawv ntawm lub cell.

Yuav ua li cas yog cell division

Nrog meiosis muab phev thiab ovum. Lub essence ntawm no yog lub tsim ntawm plaub haploid gametes los ntawm leej niam ntawm tes nrog ib tug muab ob npaug rau txheej chromosomes. Vim li no nws yog hu ua meiosis. Qhov no yog qho tseem ceeb heev vim hais tias thaum lub sij hawm fertilization ntawm kev pw ua ke hlwb, ib lub cev tshiab, muaj ib nrab ntawm cov kev tshuaj ntsuam genetic ntaub ntawv los ntawm leej niam thiab leej txiv. Thiab qhov no yog tau tsuas yog nyob rau hauv cov mob uas lub gametes yog haploid.

Uas hlwb yog tsim los ntawm mitosis? Cov lus teb yooj yim yog diploid, uas yog, nrog ib tug muab ob npaug rau chromosome teeb. Qhov no kuj yog qhov tseem ceeb. Qhov no yog hais tias raws li ib tug tshwm sim ntawm mitosis ua hlwb uas yog ib tug caij nyoog daim ntawv ntawm cov niam txiv. Tag nrho cov ntawm lawv yog cov Somatic.

Cov theem ntawm mitosis

Tus txheej txheem ntawm txoj kev tshiab Somatic cell muaj xws li ob peb theem. Lawv zuag qhia tag nrho ntev, nyob ntawm seb lub hom kab mob mas nws txawv ntawm ib tug ob peb feeb mus rau ob peb teev.

Cov thawj zaug rau theem no yog hu ua prophase. Thaum lub sij hawm no muaj ib tug xov ntawm chromatin compaction, yuav txo tau ntawm nucleoli, mitotic ntxaiv tsim. cov tub ntxhais plhaub disintegrates vim chromosomes poob mus rau hauv lub cytoplasm.

Qhov thib ob theem yog hu ua tus metaphase. Nws essence lies nyob rau hauv kev tsim kho ntawm lub chromosomes nyob rau hauv tib lub dav hlau thiab attaching lawv ntxaiv threads. Qhov no yog ua raws li los ntawm anaphase, uas yog lub feem ntau luv luv-lived theem. Raws li ib tug tshwm sim ntawm mitosis ua siab tsim tus ntxhais lub hlwb. Qhov no txoj kev xaus nyob rau hauv kauj ruam telophase. Nyob rau tib lub chromosome dispiralized. Lawv yog cov yuav luag tsis pom nyob rau hauv lub teeb tshuab kuaj kab mob. Tom ntej no, hais txog chromatids pib tsim cov tub ntxhais plhaub thiab faib ntxaiv disappears maj.

Yuav ua li cas muaj ntau yam hlwb tsim los ntawm mitosis

Mitosis raws li ib tug txoj kev division ntawm eukaryotic hlwb yog lub feem ntau nyob rau hauv cov xwm. Rov qab los ntawm poob lossis puas qhov chaw ntawm lub cev yog precisely vim hais tias ntawm txoj kev no. Raws li ib tug tshwm sim ntawm mitosis ob tus ntxhais lub hlwb yog tsim los ntawm ib tug niam txiv. Nyob rau tib lub sij hawm, vim lub doubling ntawm cov DNA molecules nyob rau hauv lub interphase ntawm lub cell voj voog, muaj tseem yog ib tug diploid chromosome teeb.

Mitosis - lub hauv paus ntawm tag nrho cov hom ntawm asexual tu tub tu kiv: vegetative - nyob rau hauv cov nroj tsuag, cell division rau hauv ob qhov chaw - lub simplest, multi-cais - lub kabmob Malaria, spore - fungi thiab ferns, budding - coelenterates.

Lub lom tseem ceeb ntawm mitosis

Lub hlwb yog tsim los ntawm mitosis nrog tib chromosome teem raws li cov niam txiv. Raws li ib tug tshwm sim hauv tus txheej txheem ntawm Identify caj ces, tsis muaj teeb meem ntau npaum li cas ruaj khov division ntawm tej ris tawm. Thaum lub sij hawm tus txheej txheem no tseem tu ncua thiab tus naj npawb ntawm cov chromosomes, thiab ib theem zuj zus ntawm nucleotides nyob rau hauv DNA molecules.

Yog li, raws li ib tug tshwm sim ntawm mitosis los ntawm ib tug cell tsim ob tus ntxhais uas siab replicate tus thawj. Qhov no saib kuas lub stability ntawm karyotypes thiab yog ib tug yuavtsum tau kawm uantej rau lub hav zoov ntawm tag nrho cov uas muaj sia nyob thoob plaws lub sij hawm ntawm lawv ib tug thiab keeb kwm kev loj hlob.