Chii chinonzi chromatid? Education chromatids

Chii chinonzi chromatid? Cell nokupesana kunokosha kuti upenyu zvipuka zvine masero akawanda. Pakupedzisira, takasikwa zvose kubva sero rimwe chete, izvo yakakamurwa zvakare uye zvakare. Panguva iyi, pamwe musimboti sezvo vamwe kwokushanduka masero eukaryotic, makatumidzwa mitosis uye meiosis. Chromatids - kopi okutodza kuti vakasikwa pamberi fission yenyukireya.

Variability mukati mhando

Kana totaura shanduka, majini kusiyana zvinokosha zvikuru. In meiosis (chirongwa fission yenyukireya) paumbwe haploid gamete masero - dzisingaoneki uye ovum. kusiyana Genetic kunowedzera nemirayiridzo huru mbiri. Chekutanga, nyika homologous okutodza vanokamurwa randomly muzvitokisi mwanasikana, saka pane zvakawanda zvinoita mubatanidzwa rwaamai uye yemadzibaba okutodza. Homologous recombination (kupanana sequences) ndiyo yechipiri Tingawedzera majini kusiyana.

Chii chromatids: Definition

Panguva Sero weboka akagadzirwa zvakafanana vari vakabatana pamwe chete munzvimbo yainzi centromere. Kamwe kuizwi hanzvadzi chromatids vanoparadzaniswa takarirana anaphase pamusoro mitosis, mumwe nomumwe wavo awana zita idzva - mwanasikana okutodza. Ndechipi chromatid mu zvipenyu? Noruzivo rwesayenzi, ndiyo imwe 2 nucleoprotein filaments inoumbwa doubling ari okutodza kuti kunoitika munguva sero nokupesana. Ivo ndiyo hafu maviri akafanana makopi kudzokororwa okutodza.

Education chromatids

Chromatin - a DNA kuti vanga akapoteredza mapuroteni, nokudaro wezvamatongerwe zononoka fibers. Zviri kubva kwavari uye makaumba chromatid. kuberekana Asati chromosome anooneka somunhu chromatids chete-nezano. Pashure kuberekana, zvinovawo yaizivikanwa zvose X-zvakaumbwa. Sero romunhu mumwe nomumwe rine 23 chromosome mbiri, vane nhamba 46 okutodza.

mhedziso

Chromatid akadana kana ari makopi maviri morekuru reDNA pamwe vanoumba mumwe chromosome zvaimbonzi kudzokororwa, uye kwakabatana munzvimbo inonzi centromere. Zita iri rinoshandiswa sokuvapo izvi chete centromeres kuramba zvakananga kuonana. Kana okutodza vakakamurwa panguva anaphase kuti meiosis kana mitosis, kuti filamentous chromatids vanova vana okutodza. Zvichitaurwa zviri nyore, izvozvo sezvikamu ari kudzokororwa okutodza.