Chii zygote, Ndezvipi zvayo unhu uye kukura

Kuti tinzwisise sei muitiro wekusangana uye kuzvarwa upenyu hutsva, unofanira uzive dzinokosha idzi. Zvakakodzera kukurira chokuti wakadaro zygote. Uye zvakare mhinduro nemimwe mibvunzo sei aumbwa, rine zvakananga features, Ndezvipi zvinhanho yawo pakuzadzisa chingambotadzisa nayo.

Ngatitangei kubvira pakutanga, pamwe mhinduro wokutanga mubvunzo. Chii zygote? Izvi muchitokisi, izvo chakaumbwa kwemapazi vaviri nevabereki utachiona masero muinonzi muchangosangana. Ndiwo maitiro kwomurume zvipenyu akashandiswa ruminant pavo. By venyama vanoumba zygote, havasi chete vanhu nemhuka asiwo zvinomera zvakawanda uye hunokuvadza. Izwi wapinda imwe nyanzvi Eduard Strasburger kubva kuGermany mukupera kwezana remakore rechi19.

Nekuona kuti zygote, yeuka chii chakaitika masero kuti zvinoita. Sex muzvitokisi, kana gametes, anobudiswa neZvapupu chaiyo zvomukati (bonde), ivo dzinoratidzwa nokuvapo imwe (haploid) yakatarwa okutodza. Sezvatakurukura kunzwisiswa, zygote inotungamirwa kunoitika pamusana mubatanidzwa gametes maviri, izvo zvinoreva kuti rine mbiri (diploid) iine DNA vatakuri. Sero Unique, achipa pave muviri mutsva, kubudikidza tsanangudzo, masayendisiti, ndizvo totipotent. Kuti Ndiko kubereka zvachose chero musero rwomuviri. Chiizve kufarira muchitokisi ichi chivako? The zygote runoparadzanisa pakutanga havana kufanana muchitokisi chenguva dzose. Pamberi mapoka hapana padanho kukura, uye somugumisiro mumwe unozotevera mwanasikana masero zvichava zvishoma pane yapfuura vaya. Somugumisiro anotevedzana fragmentations, kuti zai anova akafanana bheri mulberry.

Kana tikafunga zvose muitiro kukura embryo rose, zvinokwanisika mhinduro kumubvunzo chii zygote, sezvinotevera. Zviri mumwe nzendo kwayo kukura. Danho rokutanga iri nyaya anonzi gametes, uye nekutambira matanho chakaitika anotevedzana zvachinja zygote. Hedzinoi anotevedzana kwevari Kusiyanisa yacho utachiona. Next, mushure zygote Danho - Mórula (haana mhango ari murwiyo), uchiteverwa blastula (kuroorwa mudumbu), gastrula (-rukoko matatu mudumbu) pakupedzisira neurula, izvo zvishoma nezvishoma ichichinja organogenesis.

Sezvineiwo, isu katsamba inofadza anongedze: kuti zygote danho kuti mupenyu Muviri may tsime seranonoka. Izvi zvinoitika muna notumwe uye algae. Mushure pakusangana uye paumbwe sero diploid zvinova mira uye anorambira kwenguva refu. Panyaya iyi, sero rinonzi zygospore. Muvanhu, mumwe zororo nguva iri maawa matatu chete. Panguva ino, embryo ramangwana zvinofamba kupinda fallopian chubhu kupinda dumbu, apo nokufamba kwenguva vachatitaka muchibereko zviri ovum iri lining. Kukanganisa dzose aibuda kwacho pacharo uye pakuzadzisa ari zygote kungava kunaka zvinhu zvakadai kunotouraya pachiyero munhu majini kana okutodza yose, kushandiswa munhukadzi doro, mishonga marwadzo, zvimwe mishonga, kusvuta, nemavhairasi zvirwere.