Video: Vim li cas centromere tseem ceeb hauv mitosis?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Centromere Muaj nuj nqi
Ib loj function ua a chaw nyob yog koom tus muam chromatids. Ntawm txhua chromatid, lub kinetochore cov ntaub ntawv ntawm lub chaw nyob cheeb tsam ntawm DNA. Thaum tag nrho cov chromatids txuas nrog rau mitotic spindle, cov microtubules rub cov viv ncaus chromatids sib nrug rau hauv ob lub neej yav tom ntej tus ntxhais.
Tsuas yog li ntawd, qhov tseem ceeb ntawm centromeres rau mitosis yog dab tsi?
Lub luag haujlwm tseem ceeb ntawm lub centromere yog muab lub hauv paus rau kev sib sau ua ke ntawm kinetochore, uas yog lub hauv paus rau protein ntau complex tseem ceeb rau kev sib cais chromosomal thaum lub sij hawm mitosis. Hauv electron micrographs ntawm mitotic chromosomes, kinetochores tshwm sim raws li cov qauv platelike muaj li ntawm ob peb txheej (Daim duab 4).
Tsis tas li ntawd, yuav ua li cas yog tias tsis muaj centromere? Yog li ntawd, chaw nyob plays lub luag haujlwm tseem ceeb hauv kev faib cov khoom siv caj ces sib npaug rau cov hlwb tshiab. Yog tsis muaj centromere , lub voj voog ntawm tes yuav tsis yog mus. Yog Nws yog irreparable, lub defective cell (tus nrog tsis muaj centromere ) yuav raug rhuav tshem los ntawm ntau yam proteins thiab txoj hauv kev.
Tsuas yog li ntawd, yuav ua li cas tshwm sim rau centromeres thaum lub sij hawm mitosis?
Hauv prophase ntawm mob mitosis , tshwj xeeb cheeb tsam ntawm centromeres hu ua kinetochores txuas chromosomes rau spindle polar fibers. Thaum anaphase, ua ke centromeres nyob rau hauv txhua qhov sib txawv chromosome pib sib cais raws li tus ntxhais chromosomes raug rub chaw nyob thawj mus rau qhov kawg ntawm lub cell.
Peb txoj haujlwm centromere yog dab tsi?
Tib neeg chromosomes
| Chromosome | Centromere txoj hauj lwm (Mbp) | Qeb |
|---|---|---|
| 1 | 125.0 | metacentric |
| 2 | 93.3 | submetacentric |
| 3 | 91.0 | metacentric |
| 4 | 50.4 | submetacentric |
Pom zoo:
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