Video: Nyob rau theem twg DNA nyuaj tshaj plaws kom pom nyob rau hauv lub tshuab tsom iav?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
DNA yog qhov nyuaj tshaj plaws kom pom ntawm prophase theem ntawm mitosis. Piav: Ntawm prophase theem, tsis zoo txhais chromosomes muaj nyob. DNA yog tam sim no nyob rau hauv daim ntawv ntawm nyias chromatin fibers uas nyuaj rau pom nyob rau hauv lub microscope.
Kuj paub, dab tsi yog theem nyuaj tshaj plaws ntawm mitosis los txheeb xyuas?
Txij li thaum prophase thiab prometaphase yog qhov nyuaj rau kev paub qhov txawv, faib cov hlwb li prophase.
Tsis tas li ntawd, theem twg yog chromosomes pom tau zoo? Thaum lub sij hawm interphase (1), chromatin nyob rau hauv nws qhov tsawg kawg nkaus condensed lub xeev thiab zoo li xoob faib thoob plaws hauv lub nucleus. Chromatin condensation pib thaum lub sij hawm prophase (2) thiab chromosomes ua pom . Chromosomes nyob twj ywm condensed thoob plaws hauv ntau yam theem mitosis (2-5).
Yog li ntawd, DNA tshwm sim theem twg?
Thaum lub sij hawm Mitosis, DNA yog replicated thaum lub sij hawm S theem (Synthesis theem) ntawm Interphase. Interphase yog qhov pib lub neej txhua hnub ntawm lub xov tooj ntawm tes. Cells siv feem ntau ntawm lawv lub neej hauv Interphase ua ntej Mitosis tshwm sim ( M theem ).
Vim li cas koj thiaj tsis pom DNA chromosomes thaum lub sij hawm interphase?
Tsis muaj , chromosomes yog tsis yog pom thaum tus Interphase ntawm cell cycle bcoz ntawm cov dej ntau hauv cov nucleus. Raws li cov ntsiab lus dej ntau dua hauv cov nucleus. lawv tshwm sim zoo li xov zoo li cov qauv hu ua chromatin, uas condenses (Loose water) los tsim cov qauv compact hu ua chromosomes.
Pom zoo:
Lub lens twg yog siv rau hauv tsom iav raj?
Hom telescope no hu ua refracting telescope.Feem ntau refracting telescopes siv ob lub ntsiab lo ntsiab muag. Qhov loj tshaj plaws yog hu ua lub hom phiaj lens, thiab lub lens me dua siv rau kev saib yog hu ua eyepiece lens
Nyob rau theem twg DNA nyuaj tshaj plaws pom nyob rau hauv lub tshuab tsom iav?
DNA yog qhov nyuaj tshaj plaws kom pom ntawm prophase theem ntawm mitosis. Kev piav qhia: Nyob rau theem prophase, tsis muaj cov chromosomes txhais tau zoo. DNA yog tam sim no nyob rau hauv daim ntawv ntawm nyias chromatin fibers uas nyuaj rau pom nyob rau hauv lub microscope
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