The kutenderera upenyu masero - nguva kubva pakuberekwa wayo yakazvimirira kupesana kana rufu

The kutenderera muupenyu masero - nguva zvepakutanga chairema vapenyu kubva inception aro yayo weboka weboka kana rufu. Unosanganisira zvose zvakasikwa kuchinja vanosangana organelles kuita mabasa aro.

Zvichienderana kwayo sangano uye specialization mureza sero kutenderera hunogona kugara pa maminitsi 30 uye 3 days. Somuenzaniso, apo nokupwanywa masero ari echinoderms upenyu kutenderera iri maminitsi 30, uye intestinal Epiderme e muvanhu - ne maawa 12. Kunewo vaya zviumbu inokosha mupenyu, iro havana kuparadzaniswa, kureva, regai bereka, vari kuita zvavo nechinangwa nerevane kufa - .. kwakadaro sezvo tsinga, striated tsandanyama fibers. Self Sero upenyu kutenderera inogona rakakamurwa nguva mbiri: interphase, kana nguva kukura uye mitosis - nguva nokupesana. Interphase inosanganisira ukuwo, vanoverengeka maitikiro:

1. G1 (postmitotic) - kutanga kukura danho. Panguva iyi, kereke mRNA, mapuroteni nezvimwewo muchitokisi zvinoriumba.
2. S (chakaita zvokugadzirwa) - kunoitika DNA kuberekana, iyo inosvitsa munhu doubling yokugara zvinhu. Panoperera danho maviri yakafanana DNA kaviri akamonyoroka. Imwe neimwe tambo pakati deoxyribonucleic asidhi unotora rimwe zononoka mutana, uye wechipiri - imwe itsva, iyo yakaumbwa pamusoro maererano complementarity.
3. G2 (premitotic) - iri rokugadzira muitiro, zvinosanganisira kururamiswa zvikanganiso akaita panguva DNA usage muzvirevo chokutambudzika. Wanda zvinovaka muviri, simba, ramba synthesize mapurotini uye RNA.

The chinokosha ndiko kubereka mitotic kutenderera muchitokisi proliferative kana unotanga zvakananga pashure G2. Zviri chine pezvakaitwa kuti kuitika zvokutanga STRUCTURAL chairema kurarama kubva mumwe weboka kune mugumo uye vanoumba chizvarwa chitsva chikamu masero. Mitosis Nde mhando somatic weboka (kwete kuita zvepabonde kubereka) kuti zvokutanga vamapoka zvenyukireya zvinenge.

The upenyu kunoita masero zvinokosha kuti muviri, ichipa kuchengeteka nhamba uye chimiro okutodza yo mumwe kwemarudzi (karyotype), saka zvakakosha kuti zvose nokupesana nguva akapfuura pasina nyonganyonga. Mitosis rinoumbwa 4 anotevedzana maitikiro:

1. Prophase. Panguva iyi, sero kupesana kunoitika uye kupokana namatanda centrioles, ayo interconnected pedyo chokurukisa kupesana. Pakazopera iyi nucleoli dziparare chromosome thickened uye kutapudzwa, i.e. ndizvo condensation yavo.
2. Metaphase. Nucleoprotein mamiriro dzichienderana pamwe neequator masero kuumbwa metaphase ndiro. Anouya mukuru constriction pakati okutodza. Zvadaro, mumwe nomumwe wavo rakakamurwa chromatids maviri.
3. Anaphase. Kuyaruka obrazovashiesya mwanasikana okutodza kune zvakasiyana nematanda, apo vari sandara panze uye usununguke zvako.
4. Telophase. Kudzosera nucleolus uye makirisito weboka cytoplasm kunoitika.

Saka, sero kutenderera - nguva upenyu kubva pakuzvarwa kusvikira zvepakutanga chairema rufu yavapenyu.