Ichi chikamu chekutanga chekuberekera chidimbu
A zygote ndiyo kubatana kweperm cell uye egg cell. Iyo inozivikanwawo sekuti ovom fertilized, zygote inotanga sechinhu chimwe chete asi inoparadzanisa nokukurumidza mumazuva anotevera kubereka. Mushure mekunge kwemavhiki maviri echitanhatu, sygote pakupedzisira inova mucheche. Kana izvi zvikafamba zvakanaka, embryo inova fetus.
Zygotes Yakaita Sei?
Nekuda kwekuberekwa kuitwe, imwe chete yemasero masero inofanira kuvhara kunze kwepamusoro yeii.
Mune zviitiko zvakawanda, kamwe chete zero rinosunungurwa panguva yechikamu chekuvhenekera kwemwedzi wekuberekwa kwemukadzi. Kazhinji, zviuru zvehumi dzinoedza kupindira iyi imwe mazai masero. Kamwe kamwe bundu rimwe rakaputsa mukati, kunze kwemukati, chimiro chinoshandiswa mumusoro cheii chinodzivirira imwe mbeu kuti isapinda.
Izvi zvinowanzoitika panguva yekuita zvepabonde, kunyange zvazvo mishonga inobatsira kubereka inogonawo. Intrauterine insemination (IUI) uye in vitro fertilization (IVF) maviri anowanzoshandiswa mashandisirwo ekuberekorora maitiro.
Munguva yeIUI, mbeu inowanirwa mukati mechiberekero uchishandisa catheter kuitira kuti kubereka kuitike mukati memuviri wemukadzi. MuAVF, mazai anobviswa kubva mumavhizha uye anogadzirwa mubazi. Iyo zygote inobva yaiswa mubereki.
Chii Chinoitika Pashure Pekudyisa?
Iyo zygote inoparadzanisa nenzira inonzi mitosis, umo rimwe nerimwe reese rinowedzera nokuparadzanisa mumasero maviri.
Iyi svondo remavhiki maviri inozivikanwa sembeu yekukura uye inovhara nguva yekuita pamuviri kune kuiswa kweiyo embryo mudumbu.
Muzviitiko zvizhinji, imwe nhengo yevarume nevakadzikadzi yese yesero ine ma chromosomes 23. Mbeu yesero inenge ine genetic ruzivo kubva kuna baba apo egg iri rinenge rine genetic ruzivo kubva kuna amai.
Nokuti sero rimwe nerimwe rine hafu yezvinyorwa zvemashoko, sero rimwe nerimwe rinozivikanwa se haploid cell.
Apo aya maviri haploid masero anosangana, anoumba imwe chete diploid cell inosvika 46 ma chromosomes. Iyo zygote inofamba ichienda pasi kune tambo ye fallopian kusvika kumuberekwa iyo inofanirwa kuiswa mumigero kuitira kuti iwane zvokudya zvinoda kukura uye kurarama.
Kana izvi zvikafamba zvakanaka, zygote dzicharamba dzichikura kusvikira dzasvika pachikamu chinotevera chekurera.
Chikamu cheZygote Chine Nguva Yakadini?
Nguva ye zygote yakajeka kwenguva refu, inogara kwemazuva mana. Munenge zuva rechishanu, uwandu hwemasero hunozivikanwa se blastocyst. Mhinzwa iyo ichapera mazuva anenge gumi nemana, mushure mokunge nguva yekumbryonic ichatanga.
Nguva yechipiri yekufambira inotora kubva mavhiki maviri mushure mekuberekwa mukati mevhiki rechisere, panguva iyo iyo mhuka inozivikanwa seyembryo. Pavhiki yepfumbamwe mushure mekubata pamuviri, nguva ye fetal inotanga. Kubva panguva ino kusvika pakuberekwa, mhuka inozivikanwa seye fetus.
Hasi zygotes dzose dzinozviisa kumutsara unotevera wekukura kwepabonde, zvakadaro. Vatsvakurudzi vanofungidzira kuti 30 kusvika ku70 muzana yezvisikwa zvose zvinowanzoitika zvinokundikana kana zvisati zvaitika kana panguva yekusimudzirwa.Source:
> Sources:
> Niakan, K., et al "Human pre-implantation embryo development." Kuvandudza March 2012