Umxholo 'wokuzalwa wobomi obutsha', njengomthetho, ulinganiselwe kuphela ngemibutho malunga nokukhulelwa komntwana ngenxa yesiganeko esinomdla weqanda kunye nesidoda. Ukongezelela, ngokobuninzi, ukukhulelwa kwenzeka, intombazane ikhula kwaye isisu esikhulu sikhula kwikamva elizayo. Yintoni efunekayo ukuba isilumko, yonke into iyinto elula ... Enyanisweni, ukuphuhliswa kokubeletha komntu kuyinkqubo ebalulekileyo kwaye iyinkimbinkimbi, efuna ukufundisisa ngokujulile. Masizame ukuqonda ubuqhetseba besinye sezigaba zalo - ukuhlukana kwe-zygote.
I-Zygote yintlobo yesityalo se-ovum. Kuqulethwe ukuchumisa, okungenzeka emva kweentsuku ezintathu emva kokulala ngokwesondo, ukuphuhliswa kwe-intrauterine yomntu kuqala. Njengomphumo wokungena kwe-spermatozoon kwiqanda, i-nuclei yabo idibanisa neeseti ze-chromosomal ze-23 kunye nama-chromosomes omama angama-23 kunye ne-nucleus yenziwe kunye neqoqo elipheleleyo lama-chromosomes angama-46 ahlala kuzo zonke iiseli zomzimba, ngaphandle kweeseli zomzimba. Emva koko, i-zygote iyachithwa.
Ukwahlukana komntu we-zygote ngumsebenzi weentsuku eziyi-3-4 wokuhlukanisa imbungu kwiincinci ezincinci zeeseli ngokuzalisa isakhiwo sawo ngendlela efana nesakhiwo senqama yomama (i-mitosis okanye i-fission ngohlobo lwe-cloning) ngelixa ligcina ubukhulu bayo (malunga no-130 μm). Iiblastomers - iiseli ezenziwe ngexesha lokwahlukana kwe-zygote, zikwahlula, kwaye ngamaxabiso ahlukeneyo, ngamanye amagama, ukwahlula kwabo akuhambelani.
Ngenxa yesahlulo sokuqala se-zygote, kukho iiblastomeres ezimbini ezihlukeneyo. Enye, enkulu, "emnyama", isiseko sokuphuhliswa kwezicubu kunye nezitho zombungu. Isethi yamablastomeres amakhulu afunyenwe kwizigaba ezalandelayo kuthiwa yi-embryoblast. Uhlobo lwesibini, oluncinane kunye "olukhanyayo" lwe-blastomer, ukwahlukana okwenzeka ngokukhawuleza, lubekwe isethi efana neyo-trophoblast. Ngoncedo lwayo kukho iminwe efana ne-villi, eyimfuneko yokulungiswa kokulandelwa kwe-zygote kwisigxina se-uterine. I-Blastomeres, ngaphandle kokuthintana nomnye nomnye, iqhutywe ngoncedo lwegobolondo elikhazimulayo leqanda. Ukuphuka kwayo kungakhokelela ekuphuhliseni ama-embryos afana nemfuyo, umzekelo, amawele afanayo.
Ukubonakala kwimbungu emininzi
Ngenxa yokuqhekeka kwe-zygote, i-embryo ehlukeneyo, eyenziwe ngamacandelwana eselula e-embryoblast (ngaphakathi) kunye ne-trophoblast (i-periphery). Le yinqanaba le-morula - ixesha lokuphuhliswa kwamamriyori, apho kukho iiseli ezilikhulu ekuhlanjeni, ukutyumza kunye
Malunga ne-9th-10th day, i-embryo (ukufakelwa kwe-embryo) ikhula kwindonga yesisu, esele ihlala kwindawo epheleleyo yeeseli zayo. Ukususela ngeli xesha umfazi uyeka umjikelezo wokuya esikhathini, kwaye unokumisela ukuqala kokukhulelwa.