Wannan lokaci na farko na tsarin haihuwa shine takaice
Zygote shine ƙungiyar kwayar halitta da kwayar halitta. Har ila yau an san shi azaman ovum, zygote ya fara ne a matsayin tantanin tantanin halitta amma ya rabu da sauri a cikin kwanakin bayan haɗuwa. Bayan wannan makon mako biyu na rarrabewar sel, zygote ya zama jaratin. Idan wannan yayi kyau, amfrayo ya zama tayin.
Ta yaya Zygotes Form?
Don a haifar da haifuwa, kwayar halitta guda daya dole ne ta shiga cikin ƙananan samfurin.
A mafi yawancin lokuta, an saki kwayar kwai guda daya a lokacin yaduwar kwayar mace ta kowane lokaci. Yawanci, dubban mawuyacin ƙwayoyin cuta suna shiga cikin wannan kwayar kwai. Da zarar sperm daya ya rushe ta hanyar waje, canje-canje na canza jiki a cikin yakin ya hana wasu kwayoyin shiga.
Wannan tsari yakan faru ne a lokacin yin jima'i, kodayake magungunan likita zai taimaka. Cigaban intrauterine (IUI) da kuma hadewar in vitro (IVF) su biyu ne dabarun da ake amfani da su wajen haifa.
A lokacin IUI, an saka maniyyi a cikin cikin mahaifa ta amfani da kullun don maganin hadisin ya faru cikin jikin mace. A IVF, an cire qwai daga ovaries kuma an hadu a cikin wani lab. An dasa zygote a cikin mahaifa.
Menene Yake Bayyana Bayan Faɗakarwa?
Zygote ya rarraba ta hanyar tsarin da ake kira mitosis, wanda kowace tantanin halitta ta rabu biyu ta rarraba cikin kwayoyin halitta biyu.
Wannan mataki na mako biyu ana san shi azaman lokacin ci gaba kuma yana rufe lokacin tsarawa zuwa kafawar amfrayo a cikin mahaifa.
A mafi yawan lokuta, kowane jima'i na namiji da mace yana dauke da 23 chromosomes. Tarin kwayar halitta yana dauke da bayanan kwayoyin daga mahaifinsa yayin da kwayar halitta ta ƙunshi bayanan kwayoyin daga uwa.
Saboda kowane tantanin halitta ya ƙunshi rabin abincin kwayoyin halitta, an san kowane tantanin halitta a cikin cell salloid.
Lokacin da waɗannan nau'o'i guda biyu suka shiga, sun samar da kwayar diploid guda daya wadda ta ƙunshi dukkanin 46 chromosomes. Zygote sai yayi tafiya zuwa ga mahaifa a cikin mahaifa inda dole ne a shigar da shi a cikin rufi don samun abubuwan gina jiki wanda yake bukatar girma da tsira.
Idan wannan tsari ya ci gaba, zygote zai ci gaba da girma har sai ya kai matashi na gaba na ci gaba da shiga ciki.
Yaya Tsawon Zygote Phase Last?
Lokaci na zygote yana da ɗan gajeren lokaci, yana da tsawon kwanaki hudu. Kusan rana ta biyar, yawancin kwayoyin halitta sun zama sanannun blastocyst. Zamanin lokacin germinal zai ƙare kusan kwanaki goma sha huɗu, bayan haka lokacin da mahaifa zai fara.
Hanya na biyu na cigaba ta kasance daga makonni biyu bayan zuwanta ta cikin makon takwas, a wane lokaci ne aka sani da kwayar halitta azaman amfrayo. A mako tara bayan da aka tsara, lokacin tayi zai fara. Daga wannan lokaci har sai haihuwar, an san kwayar halitta a matsayin tayi.
Ba dukkan zygotes ba ne a gaba ga ci gaba na ci gaba na prenatal, duk da haka. Masu bincike sunyi kiyasin cewa kashi 30 zuwa 70 bisa dukkanin ra'ayi na al'ada ya ɓace ko dai kafin ko a lokacin da aka kafa.Kamar:
> Sources:
> Niakan, K., et al "Tsarin hakorar dan Adam na rigakafi." Gabatarwa Maris 2012