Mitosis: Maitiro Anoshamisa Ekupatsanurwa Kwesero
Mitosis inzira inokosha muhupenyu hwemasero. Imhando yekupatsanurwa kwemasero kunogadzira masero maviri mwanasikana akafanana nesero remubereki. Mitosis inoita basa guru mukukura, kukura, uye kugadziriswa kwenyama muzvisikwa zvakawanda. Chinyorwa chino chichakurukura zvinhu zvakasiyana-siyana zve mitosis, kubva pakutsanangurwa kwayo uye zvikamu zve mitosis kusvika pakukosha kwayo muchikamu chakakura chebiology.
Tsanangudzo yeMitosis
Mitosis inzira yekupatsanurana kwemasero emuviri inoita kuti sero rega rega riwane majini akafanana nesero remubereki. Maitiro aya anowanzo teverwa ne cytokinesis, kupatsanurana kwe cytoplasm kunopatsanura sero rimwe kuita masero maviri emwanasikana. Mitosis inowanzo itika mumasero emuviri (somatic) uye yakasiyana ne meiosis, iyo inoitika mumasero emhando ye germ chete kuti igadzire ma gametes.
Matanho eMitosis
Mitosis ine zvikamu zvakati wandei zvinotevedzana: prophase, prometaphase, metaphase, anaphase, uye telophase. Chikamu chimwe nechimwe chine hunhu hwakasiyana uye mabasa chaiwo mukuona kuti machromosomes anogoverwa zvakanaka kumasero emwanasikana.
1. Prophase: Danho iri ndiro kutanga kwe mitosis, apo chromatin inotanga kuungana kuita ma chromosome anoonekwa. Chromosome yega yega yakambodzokororwa kare muchikamu cheS che cell cycle uye ine ma chromatids maviri akabatana pa centromere. Pamusoro pezvo, mitotic spindle inotanga kuumbwa, uye membrane yenyukireya inotanga kuparara.
2. Prometaphase: Kamudzira kenyukireya kanopwanyika zvachose, zvichiita kuti ma microtubules e mitotic spindle ashande nema chromosomes. Ma microtubules anonamira pa kinetochores, ayo ari maumbirwo emapuroteni anoumbwa pa centromeres yema chromosomes. Maitiro aya anogadzirira ma chromosomes kuti aite chikamu chinotevera.
3. Metaphase: Muchikamu chino, machromosome akabatana nema microtubules anodhonzwa uye anorongwa kuti arongedzeke pa equator yesero, inozivikanwa se metaphase plate. Kurongeka uku kwakakosha pakupatsanurwa kwema chromosome kwakarurama.
4. Anaphase: Ma centromeres echromosome yega yega yakakamurwa, uye ma chromatids ehanzvadzi—ava kunzi ma chromosome emwanasikana—anodhonzwa akananga kumatanda akatarisana esero. Kufamba uku kunofambiswa nekupfupika kwema microtubules, ayo anodhonza ma chromosome kuenda kumatanda.
5. Telophase: Machromosome akaparadzaniswa anosvika pamatanda esero otanga kuora kuita chromatin. Ruvara rwenyukireya runotanga kuchinja-chinja kutenderera mapoka maviri akaparadzaniswa emachromosome, zvichigadzira nuclei mbiri itsva mukati mesero rimwe chete.
Cytokinesis
Cytokinesis inowanzotanga panguva ye telophase kana mushure me telophase. Ndiyo nzira yekupatsanurwa kwe cytoplasmic inoburitsa masero maviri akasiyana emwanasikana. Mumasero emhuka, cytokinesis inoitika kuburikidza nekuumbwa kwemugero unoparadzanisa sero nepakati. Mumasero ezvirimwa, madziro matsva emasero anonzi cell plate anoumbwa pakati pema nuclei maviri matsva, zvichizopedzisira zvapatsanura sero kuita mativi maviri.
Kukosha kweMitosis
Mitosis ine basa rakakosha muzvikamu zvakasiyana-siyana zvehupenyu:
1. Kukura uye Kukura: Mitosis inobvumira zvisikwa zvakawanda kukura nekukura kubva musero rimwe chete rakabatanidzwa kusvika kumasero matiririyoni. Izvi zvinobvumira kuumbwa kwenyama dzakaomarara uye nhengo panguva yekukura kwemwana ari mudumbu nezvirimwa.
2. Kugadzirisa uye Kuvandudza: Kana nyama dzemuviri dzikakuvara kana masero akakuvara, mitosis inogadzira masero matsva ekugadzirisa nekutsiva akakuvara. Semuenzaniso, ganda nemukati medumbu zvinogara zvichiitwa mitosis kutsiva masero akakuvara nemabasa ezuva nezuva.
3. Kuchengetedza Kuramba Kwemajini: Nekupa seti yakazara yemachromosome akafanana musero rega rega remwanasikana, mitosis inoita kuti ruzivo rwemajini rurambe rwakachengetedzwa kubva kuchizvarwa chimwe chemasero kuenda kune chinotevera. Izvi zvakakosha pakushanda zvakanaka uye kugadzikana kwemajini echisikigo.
Kushaikwa uye Matambudziko muMitosis
Kunyangwe mitosis ichiwanzoitika zvakanaka, dzimwe nguva zvikanganiso zvinogona kuitika. Aneuploidy, chirwere umo masero ane nhamba isina kujairika yemachromosome, chinowanzo konzerwa nekusaiswa kwemachromosome zvakanaka panguva ye mitosis. Semuenzaniso, chirwere ichi chinogona kuonekwa mumhando dzakasiyana dzekenza, uko masero anowanda asingadzoreki zvakanaka.
Zvikanganiso mu mitosis zvinogonawo kukonzera shanduko dzemajini dzinogona kubatsira mukukonzera kenza kana zvimwe zvirwere. Nokudaro, masero ane nzira dzakasiyana dzekutarisa kuti mitosis ienderere mberi nemazvo, asi kana nzira idzi dzikakundikana, mhedzisiro yacho inogona kuva yakakomba.
Tsvagiridzo uye Mashandisirwo
Kudzidza nezve mitosis hakungokoshi chete pakunzwisisa hwaro hwe biology yemasero asiwo kune zvakunobatsira mukurapa uye biotechnology. Tsvagiridzo ye mitosis inobatsira mukuwana mishonga inorwisa masero ekenza nekudzivisa mitosis. Semuenzaniso, mimwe mishonga yakagadzirirwa kukanganisa kuumbwa kwe mitotic spindle, nokudaro ichidzivirira kupatsanurwa kwemasero kusingadzoreki mukenza.
Pamusoro pezvo, tsvakiridzo pamusoro pemitosis inokurudzira hunyanzvi muinjiniya yekuvandudza uye kurapwa kwemasero, uko kudzora mitosis kunogona kushandiswa kugadzirisa kana kutsiva nyama yakakuvara.
Mhedziso
Mitosis inzira inoshamisa inokosha pakukura, kukura, uye kugadziriswa kwehupenyu hwemasero. Nekunzwisisa matanho nemaitiro anobatanidzwa, masayendisiti anogona kuongorora zvakadzama mashandiro uye kusashanda zvakanaka kwemasero muzvinhu zvipenyu. Kuenderera mberi nekutsvaga munzvimbo iyi kunovimbisa kupa rumwe ruzivo nezvekudzora kukura kwemasero uye kugona kwawo kurapa zvirwere zvakaita sekenza, zvichiita kuti mitosis ive nyaya inokosha pakusangana kwesainzi nehutano.
