Cov txheej txheem:
Video: Lub cell chromosomes hloov li cas thaum nws npaj los faib?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Chromosomes thiab cell division
Tom qab chromosome condensation, ua chromosomes condense los tsim cov qauv compact (tseem ua los ntawm ob chromatids ). Raws li ib tug cell npaj los faib , nws yuav tsum ua ib daim qauv ntawm txhua tus ntawm nws chromosomes . Ob daim ntawv luam ntawm a chromosome hu ua muam chromatids.
Ua li no, chromosomes hloov li cas thaum nws npaj los faib?
- Chromosomes ua kom nws ua tau cais DNA precisely thaum lub sij hawm cell faib . - Thaum lub sij hawm cell cycle, ib cell loj hlob, npaj rau kev faib , thiab faib tsim tau ob tug ntxhais hlwb . Thaum lub sij hawm anaphase, lub chromosomes cais thiab txav mus raws spindle fibers mus rau opposite xaus ntawm lub cell.
Tsis tas li ntawd, eukaryotic cells chromosomes hloov li cas thaum lub cell npaj los faib? Piav li cas eukaryotic cell's chromosomes hloov raws li lub cell npaj los faib . Ua ntej cell faib txhua chromosome yog luam tawm. Telophase- Chromosomes sib sau ua ke ntawm opposite xaus ntawm lub cell thiab poob qhov sib txawv; cov ntaub ntawv tshiab nuclear membrane. Ib txhia hlwb muaj ntau lub nuclei hauv lawv cov cytoplasm.
Ua li no, cov tsos ntawm chromosomes hloov li cas thaum lub cell tab tom yuav faib?
Cov teeb meem no txwv kev loj hlob ntawm cov cell . Piav li cas a cell chromosomes hloov raws li ib tug cell npaj rau faib . Zoo ua ntej cell faib , cwb chromosome yog replicated. Prophase: Chromatin condenses rau hauv chromosomes ; cov centrioles cais ; spindle pib tsim; nuclear membrane tawg.
Dab tsi yog lub luag haujlwm rau kev txav chromosomes thaum mitosis?
Spindle fibers txuas los ntawm centrioles mus rau kinetochore thiab yog lub luag haujlwm rau txav chromosomes ib ncig thaum lub sij hawm mitosis . Thaum DNA rov ua tiav tiav, kev faib hluav taws xob nuclear pib ua plaub theem: Prophase: chromosomes ua pom, lub hnab ntawv nuclear ploj mus, kinetochores thiab spindle fibers daim ntawv.
Pom zoo:
Dab tsi txav cov chromosomes thaum lub sijhawm faib cell?
Lub spindle yog ib tug qauv tsim los ntawm microtubules, muaj zog fibers uas yog ib feem ntawm lub cell "skeleton." Nws txoj haujlwm yog txhawm rau txhim kho cov chromosomes thiab txav mus los thaum lub sijhawm mitosis. Cov spindle loj hlob nruab nrab ntawm cov centrosomes thaum lawv sib nrug
Yuav ua li cas cov txheej txheem ntawm cell faib nyob rau hauv eukaryotes feem ntau zoo ib yam li cell faib nyob rau hauv prokaryotes?
Tsis zoo li eukaryotes, prokaryotes (uas suav nrog cov kab mob) tau txais ib hom kev faib cell hu ua binary fission. Hauv qee qhov, cov txheej txheem no zoo ib yam li mitosis; Nws yuav tsum tau rov ua dua ntawm cov cell chromosomes, cais ntawm cov theej DNA, thiab kev sib cais ntawm niam txiv cell cytoplasm
Dab tsi yog txheej txheem hu ua thaum lub cell nucleus faib los tsim ob lub nuclei zoo tib yam?
Qhov no tshwm sim thaum tus txheej txheem hu ua mitosis. Mitosis yog cov txheej txheem ntawm kev faib cov cell cov khoom siv caj dab rau hauv ob lub nuclei tshiab
Dab tsi yog DNA zoo li cuam tshuam nws cov qauv tshuaj rau nws zoo li cas thaum muaj ntau ntawm nws yog clumped ua ke?
Hais txog nws cov qauv tshuaj rau nws zoo li cas thaum ntau nws yog clumped ua ke. DNA zoo li kab laug sab webs. DNA tau soluble hauv DNA extraction tsis yog li peb tsis pom nws. Thaum nws tau stirred rau hauv ethanol, nws clumped ua ke thiab tsim thicker thiab thicker strands loj txaus kom pom
Dab tsi nthwv dej zoo li cov cuab yeej ntawm lub teeb ua rau nws hloov kev taw qhia thaum nws txav ntawm ib nrab mus rau lwm qhov?
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