Uninzi lwamagama asetyenziselwa ukuthetha ngokuzala ayabhideka kwaye ayaziwa nakubantu abaninzi. Ngokubanzi, igama elingekazalwa lisetyenziselwe bhekisa kumntwana okhula esibelekweniNangona kunjalo, ixesha lokumitha lihamba kuthotho lwezigaba ukusuka xa ukuchumisa kwenzeka.
Amagama amathathu, i-zygote, umbungu kunye ne-fetus, asetyenziselwa i-biology yokuzala ukubhekisa kusana oluzayo. Kodwa ngalinye kula magama libhekisa kulo amanqanaba ahlukeneyo adlula kuwo omncinci ngalo lonke ixesha lokumitha. Ukwazi umohluko phakathi kwawo onke la magama kuya kuba luncedo kakhulu nokuba ukhulelwe okanye ukhulelwe uceba ukukhulelwa.
Ngamaxesha amaninzi xa abasetyhini abakhulelweyo besiza kwagqirha, baqala ukuva amagama ezonyango kunye namagama angaqhelekanga. Kakhulu ngakumbi xa abazali bexesha elizayo beqhubeka nenkqubo ye- Ukuncedisa ukuvelisa kwakhona. Ke ngoko, ukuba nolwazi olusisiseko malunga nokuzala kunokukunceda uyiqonde ngcono inkqubo eya kukhokelela ekubeni ube ngumama okanye utata.
Zygote
Xa i-gamete yabasetyhini (i-ovum) kunye ne-gamete yamadoda (isidoda) ziyadibana, kwenzeka into yokuchumisa, ekhokelela kwiseli entsha. Le seli intsha inemathiriyeli yemfuza ngokulinganayo kumama notata, ke iqulethe ii-chromosomes ezingama-23 ezivela kutata kunye nama-23 kumama. Ke ngoko, i-zygote sisiphumo sokuchuma kweqanda kwisidoda.
I-zygote linyathelo lokuqala lobomi kwaye ukusukela kumgaqo-siseko ilayishwe nge-DNA ngolwazi lwemfuza ngemiba yexesha elizayo enje ngomzimba, umzekelo. Nangona kunjalo, ngaphandle kokuba lelinye lawona manqanaba abalulekileyo okuzala, kuba kukuqala kobomi, umntu omtsha ubizwa ngokuba iZygote ixesha elifutshane kakhulu, malunga neeyure ezingama-24 akukho nto iyenye. Nje ukuba ezo yure zokuqala zidlule, i-zygote yahlulwe yangena kwiiseli kwaye ke iqala ixesha elilandelayo, embryonic.
Umbungu
Ngokwahlulwa kweseli, ixesha lesibini lokumitha liqala, nelaziwa njengexesha lokumitha. Eli nqanaba lesibini lobomi lihlala malunga neeveki ezisi-8 kwimeko yabantu ngeli xesha, isiqu esitsha siza kufumana iimpawu zohlobo ngalunye.
Ukususela ngosuku 1 emva kwenqanaba le-zygote, ukukhula kombungu kunye nokwahlukana kweseli kuqala. Njengoko iiseli zikhula, amalungu ahlukeneyo kunye nezicubu zomntwana ozayo ziya kwenziwa. Ngexesha leeveki ezisi-8 ezizayo, umbungu uya kufumana utshintsho olubalulekileyo oluveliswa lisahlulo seseli. Nokuba umbungu ngokwawo unokufumana igama elahlukileyo kwezi veki zokuqala.
- UMorulaKwesi sigaba umbungu wenziwa liqela elikhulu leeseli ezifanayo. Ezi aqokelelwe ukwenza uhlobo lwe-blackberry, Kungoko igama elithi morula livela. Oku kwenzeka malunga nomhla wesine wokukhula kombungu.
- IBlastocyst: Iiseli ziqala ukwahlula, ukunika amaqela amabini eeseli. Oku kwenzeka phakathi komhla wesi-5 nowesi-6 wokukhula kombungu. Ukususela kulo mzuzu ukuya phambili, i-placenta kunye nazo zonke izakhiwo eziyimfuneko zokukhulelwa zikhule ngendlela yesiqhelo ziya kuqala ukwenza.
Umbungu
Xa isigaba sombungu sigqityiwe, umntu omtsha unamalungu kwaye xa amalungu ekhula, eli xesha liyaphela, kunika elona xesha lide lokumitha, inqanaba lokuzala. Ukususela ngalo mzuzu ukuya phambili, iiseli ziqala ukugxila. Kwiinyanga ezininzi ezizayo de umntwana azalwe, baya kumka ukwenza nokuphuhlisa zonke izicwili kunye namalungu.
Amalungu afana nengqondo, izintso okanye isibindi ziqala ukusebenza ngexesha lokuzalwa komntwana. Ukongeza, umbungu uya kufumana iimpawu zomzimba wosana oluya kuba lulo. Ngazo zonke ezi veki, encinci iya kukhula kwaye ikhule ngokupheleleyo, okoko nje ukukhulelwa kuqhubeka ngesiqhelo. Kuvavanyo laphambi kokubeleka uya kuba nakho ukuva ukubetha kwentliziyo yakho, ubone ukuba usana lwakho luhamba njani okanye luqhwanyaze.
Kwaye ke kufana inkqubo yomlingo yobomi iqala.