The zvipenyu kukosha mitosis

The zvipenyu kukosha mitosis chaizvo. Neposveschennomu kunyange zvakaoma kufungidzira basa reDare muupenyu nyore kwacho foni nokupesana mumuviri. Mano masero kugoverana - ichi ndicho chinonyanya kukosha basa ravo, chaipo. Pasina izvi hazvibviri kuenderera upenyu Earth, kuwedzera vanhu zvinenge vasina-celled havagoni kuva, uye akaramba nokuvapo guru zvipuka zvine masero akawanda, hazvibviri sezvo kurara kubereka kuburikidza kukura upenyu hutsva uye munhu nembeu zai.

The zvipenyu kukosha mitosis kwaisazonyanyova zvikuru kana sero weboka haana musimboti ruzhinji kuitika pamusoro redu yomuzvarirwo kwendangariro. Izvi zvinotora nzvimbo mumatanho dzakawanda. Mumwe nomumwe wavo kunosanganisira zviito akawanda mukati muchitokisi. Mugumisiro izvi fanira chokuwanziridza pamusoro majini hwaro sero rimwe chete mune hafu kuburikidza doubling DNA kuti vakazoroorwa akabereka mubereki sero mwanasikana maviri.

The upenyu hwose sero rinogona akapedzisa munguva kubva paumbwe imwe chikamu chacho unozotevera weboka kupinda maviri. Iyi nguva zviri zvipenyu inozivikanwa "masero kutenderera".

Chikamu chokutanga kwazvo mitosis - imwe gadziriro zvakakodzera muchitokisi nokupesana. Nguva umo masero rusununguko tsanga kuita zvakananga kugadzirira nokupesana, rinonzi interphase. Zvinoitika zvose chinonyanya kukosha - kureva kuti, doubling DNA tambo uye zvimwe zvivako, uyewo kwetunhu yakawanda mapuroteni. Saka, sero okutodza vari kaviri, uye mumwe nomumwe hafu miviri chromosome anonzi "chromatid".

Pashure interphase kunotanga zvakananga chirongwa weboka - mitosis. Iye, zvakare, kunoitika mumatanho dzakawanda. Somugumisiro, vose kaviri akatambanudza symmetrically ari keji, saka kuti pashure paumbwe nechepakati partition muchitokisi itsva nomumwe akaumba chete nhamba yenhengo yasara.

Maitikiro ose mitosis uye meiosis akafanana, asi vapedzisira (kuburikidza kupatsanura utachiona masero) ane mapoka maviri, uye pakupedzisira zvinoitika kwete vaviri, asi kletki mana "mwanasikana." Uyewo, asati wechipiri kupesana is chromosome doubling, saka hafu akatarwa avo anoramba ari mwanasikana mumasero.

1. Prophase. Kuyaruka, masero centrioles kwazvo kuoneka. Ndivo varipo chete muchitokisi mhuka uye vanhu. The miti havana centrioles.
2. prometaphase. Panguva iyi inoguma prophase uye metaphase kunotanga.
3. Metaphase. Panguva iyi, okutodza nhema pamusoro "neequator" muchitokisi.
4. Anaphase. Okutodza hangu nematanda siyana.
5. Telophase. Imwe sero-kuti "amai" yakakamurwa paumbwe imwe nechepakati partition huviri kletki "mwanasikana." Zvanzi rinopedzisa sero weboka kana mitosis.

Chinonyanya kukosha zvipenyu kukosha mitosis - iri anawo weboka kudzokororwa okutodza kupinda 2 yakaenzana mativi uye achivaisa mbiri kletki "mwanasikana." Mhando dzakasiyana-siyana masero uye masero zvipenyu siyana vane nguva rinopota-pota nguva nekupesana - mitosis, asi paavhareji zvinotora rimwe nehafu maawa. Pane zvakawanda zvinoita kuti kufurira ichi kusimba chaizvo urongwa. mamiriro zvemhoteredzo kuchinja chero, semuenzaniso, ambient tembiricha, chiedza danho muoti, kuti akamanikidzwa zvakatipoteredza uye ari Muviri masero uyewo zvimwe zvinhu zvakawanda zvinogona yekudyidzana kukanganisa zvose nguva uye kunaka nedanho muchitokisi weboka. Uyewo, ya mitosis uye zvose zvayo munhu matanho kunogona zvakananga novimba zvinyama mhando, mumasero chaakanga zvinobuda.

The zvipenyu kukosha mitosis nomumwe zvakawanikwa mutsva mumunda cytology kwava kukosha, nekuti pasina izvi hazvigoni kuva upenyu panyika.