Umfanekiselo WamaTwin Zygosity

Amawele amabili akha ngezindlela ezimbili ezahlukene

I-Twinning kwenzeka ngezindlela ezimbili ezahlukene. Ekuhlukaniseni amawele, i- zygosity yigama elibalulekile. Ubugovu bunikeza ukuthi amawele afana yini (monozygotic) noma ama-fraternal (i-dizygotic noma i-multizygotic). Kuyisihluthulelo sokuqonda ukuthi amawele afaka kanjani. Kodwa ngezinye izikhathi ukubonakala ngempumelelo kusebenza kakhulu kunenkcazelo ebhaliwe.

1 -

Ukubonisa i-Twin Zygosity

Lo mdwebo ubonisa ukubunjwa kwamawele amabili afanayo nalabo abafowabo. Kuwusizo ukukhombisa ukuqhathanisa ohlangothini lwezinhlelo lapho amafomu amabili afaka khona.

Izinto ezibalulekile zihlanganisa iqanda elingenalutho kanye nesidoda. Uma isidoda sikhombisa iqanda, liyiqanda le-zygote noma elikhulelwe. Ama-chromosome avela ku-nucleus yeqanda nesidoda sakha i-nucleus entsha, okwenza i-zygote entsha yokwenza izakhi zofuzo ezihlukile.

I-zygote iphinda ihlukaniswe ukuhlukaniswa kwamaseli ukwenza ibhola lamaseli. Ibeka emdongeni wesibeletho, ekwakheni i-placenta ne-chorion ukuze zondliwe ngenkathi ukhulelwe.

Uhlangothi lwesobunxele lomfanekiso lubonisa amawele e-monozygotic , awenza i-zygote (iqanda elivuthiwe) kusuka eqanda elilodwa kanye nesidoda esisodwa. I-zygote kamuva ihlukana ukuze ifake amawele amabili anezakhi zofuzo ezifanayo.

Ohlangothini olungakalungile lo mdwebo ubonisa i-twinning ye- dizygotic , lapho amaqanda amabili ekhulelwa khona nge-sperm nama-zygote amabili akhiwa, ngalinye likhula libe ngamawele. Kusukela ekuqaleni, ngayinye inokwenza izakhi zofuzo, kufana nanoma yiziphi izihlobo ezimbili ezivela kubazali abafanayo.

2 -

I-Monozygotic (Eyaziwayo) I-Twinning

Ifomu le-monozygotic amawele eqanda elilodwa, elikhulelwe elihlukanisa. Esithombeni, ungabona i-zygote eyodwa idalwa ngeqanda elilodwa kanye nesidoda esisodwa. Ihlukaniswa zibe izingxenye ezimbili ezilinganayo, kanye nefomu lezingane ezimbili.

Igama liyazichaza: i-mono (eyodwa), i-zygote (iqanda elivuthiwe).

Ngenxa yokuthi bavela ekuhlanganiseni okufanayo kwesidoda kanye neqanda ngakho-ke baqala ngesimo sofuzo esifanayo, bavame ukubonakala ngendlela efanayo futhi bangase babukeke ngendlela efanayo. Ngakho-ke, baziwa ngokuthi amawele afanayo.

Amawele e-Monozygotic ahlale efana nobulili obufanayo (ngezingavamile kakhulu). Cishe ingxenye eyodwa kwezintathu kuwo wonke amawele yi-monozygotic. Akekho owazi ngempela ukuthi yini eyenza iqanda lihlukaniswe ngemuva kokukhulelwa, ngakho-ke umsuka wokubamba ama-monozygotic uhlala ungavamile.

Qaphela ukuthi lo mfanekiso ubonisa amawele e-monozygotic ku-chorion eyabelwe, ene-placenta eyodwa. Lesi simo sichazwa ngokuthi amawele e- monochorionic . Nokho, akuzona zonke amawele e-monozygotic akha ngale ndlela. Amanye amawele e-monozygotic akhula ngamasaka ahlukene ngamaplascenta amabili .

Lokhu kungaba yisibonakaliso sokuthi i-zygote ihlukana kanjani ekuqaleni ukwenza amawele. Ukushayalaza ngezinsuku ezintathu zokuqala kungabangela iwele ngalinye libe nesigxobo kanye ne-placenta. Ukuthungula emva kwaleli phuzu kubangele ukwabelana nge-placenta.

3 -

I-Dizygotic (Fraternal) I-Twinning

Kulo mfanekiso, ubona umfanekiso we-twinning dizygotic . Lokhu kuvame ukubizwa ngokuthi iwele lokuzalwa. Amaqanda amabili ahlwanyelwa izidalwa ezimbili ezihlukene. Ama-zygote amabili akhiqiza imibungu emibili eholela ezinganeni ezimbili.

Leli gama livela ku-root (ezimbili) ne-zygote (iqanda elivuthiwe.) Le nqubo ibizwa nangokuthi i-twinning ye-multizygotic, lapho ikhiqiza ama-multiple multiples oda, njengama-triplets noma ama-quadruplets.

Amawele e-Dizygotic ahlukaniswe namawele e-monozygotic ngokuthi avela kuma-zygotes ahlukene ngokuphelele. Isizinda sabo sezakhi zofuzo kufana nanoma yiziphi izihlobo ezimbili. Bahlakulela ngamasaka ahlukile, ngamaplascenta ahlukene.

Iningi lamawele, cishe amabili kuya kwezintathu, liyi-dizygotic. Bangaba amantombazane amabili, abafana ababili, noma omunye wabo ngamunye.