Video: Cov ntsiab lus DNA hloov pauv li cas thaum lub sij hawm lub voj voog ntawm tes thiab mitosis?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Tus nqi ntawm DNA hauv ib cell hloov ua raws li txhua yam hauv qab no: fertilization, DNA synthesis, mob mitosis , thiab meiosis (Fig 2.14). Yog tias cell nkag mus mob mitosis , txhua tus ntxhais cell yuav rov qab mus rau 2c thiab 2n, vim nws yuav tau txais ib nrab ntawm cov DNA , thiab ib qho ntawm txhua khub niam txiv chromatids.
Raws li qhov tshwm sim, yuav ua li cas rau DNA thaum lub voj voog ntawm tes?
Thaum interphase, ua cell loj hlob thiab ua ib daim qauv ntawm nws DNA . Thaum mitotic (M) theem, cell cais nws DNA ua ob pawg thiab faib nws cov cytoplasm, tsim ob qho tshiab hlwb.
Ib yam li ntawd, cov DNA puas hloov pauv thaum lub sij hawm mitosis? Cov chromosome tus lej yog tib yam hauv cov ntxhais hlwb li nws yog hauv niam txiv cell. Vim DNA yog luam tawm thaum interphase ua ntej lub cell nkag mus mob mitosis , cov tus nqi ntawm DNA hauv thawj niam txiv cell thiab cov ntxhais cell yeej ib yam nkaus.
Kuj Paub, dab tsi tshwm sim rau DNA hauv txhua theem ntawm mitosis?
Thaum lub sij hawm S theem , duplicate luam ntawm txhua chromosome yog synthesized. Tom qab interphase tiav, mob mitosis tuaj yeem pib. Thawj kauj ruam yog prophase. Thaum lub sij hawm prophase, lub hnab ntawv nuclear nyob ib puag ncig DNA pib ploj mus thiab DNA condenses rau hauv chromosomes.
Vim li cas tus nqi ntawm DNA hloov thaum lub voj voog ntawm tes?
S-phase feem ntawm interphase yog thaum lub DNA cov ntsiab lus ntawm a cell nce. Thaum The S Phase, cell replicates nws cov khoom siv caj ces kom txhua chromosome yuav muaj ob lub molecules ntawm DNA . Yog li, tom qab ua tiav ntawm S theem, tus cell muaj tib tus lej ntawm chromosomes, tab sis nws DNA cov ntsiab lus tau ob npaug.
Pom zoo:
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