Kungenzeka ukuthi uzwile mayelana "nomphumela wezinhlangothi," ukuhlanganiswa phakathi kokuthatha amaphilisi okulawula ukubeletha nokwahlupha. Kuthiwa ukuthi uma ukhulelwe ngokushesha nje ngemva kokuyeka ukusebenzisa amaphilisi okulawula ukubeletha, amathuba okuba namawele akhula. Ngesikhathi usebenzisa amaphilisi okuvimbela ukubeletha, i- ovulation iyasuswa. Uma sebeqedile, kucatshangwa ukuthi ama-ovari angase ahlaziye futhi avuselele, akhulule amaqanda angaphezu kweyodwa emjikelezweni futhi akhulise ithuba lokukhulelwa amawele angama-dizygotic noma amawele.
I-Connection Between Twinning nePill Control Control
Lo mqondo ngokuyinhloko ususelwe ocwaningweni luka-1977 olwanyatheliswa eNew England Journal of Medicine olwakubonisa ukuthi abesifazane abakhulelwe ngokushesha nje ngemva kokuyeka ukuvimbela izakhi zomlomo babephindwe kabili ukuthi babe namawele. Lawa mawele ngama-dizygotic (abazalwane), kunokuba abe monozygotic (afanayo).
Amawele ama-dizygotic amafomu lapho amaqanda amabili ahlukene ehlonyiswa khona ngamabhodlela amabili ahlukene, asekela umqondo wokuthi ama-ovari akhulula amaqanda amaningi ngokuphendula ukumisa amaphilisi okukhulelwa. Ngokusho kocwaningo, ngemuva kokuphumula iphilisi izinyanga ezimbalwa, ukuvuthwa kufanele kubuyele iphethini evamile yeqanda elilodwa ngenyanga, futhi amathuba okuba amawele ancishiselwa kumazinga avamile.
Ucwaningo Luxubile
I-"effect effect" ayiphenywanga yonke into kusukela ngo-1977 isifundo eNew England Journal of Medicine, futhi yikuphi ukucwaninga okuncane okukhona okuye kwaxubaniswa.
Ucwaningo olulodwa lwe-1989 lwaphetha ngokuthi ukukhulelwa engakapheli unyaka emva kokuthatha izitho zomzimba zomlomo kancane kwandisa amathuba akho amawele e-monozygotic (afanayo). Kodwa esinye isifundo esikhulu ngo-1987 asibonanga ukuhlangana phakathi kwamawele kanye nokuthatha isisu somlomo.
Ngokwemvelo, amama amaningi amawele asho ukuthatha ukukhulelwa masinyane emva kokuyeka amaphilisi okulawula ukubeletha ngenxa yokuthi bakhulelwe amawele.
Ezinye Izimbangela Zezinwele Zomfowabo
Kunezizathu eziningi ezingenzeka ukuthi kungani ungakhulelwa ngamawele womzalwane, kufaka phakathi:
- Izakhi zofuzo : Abanye besifazane bangase bahlasele njalo futhi kubonakala sengathi kukhona isakhi , noma mhlawumbe izakhi zofuzo eziningi, ezibangela ukuba benze kanjalo. Nakuba bobabili abesilisa nabesifazane bathwala isakhi, abesifazane kuphela abavuthayo, ngakho-ke owesifazane onesisindo ophethe i-hyper ovulates angase abe namawele womfowabo. Indoda enegeni ngeke ibe nomama, kepha ingadlulisela umkhuba kuye indodakazi yakhe, mhlawumbe ingabe ifuna ukuba namawele. Kulula nje, owesifazane angathola ifa lolo hlobo ukuze akhiqize amaqanda angaphezu kweyodwa kusuka kunina noma uyise noma kubazali bobabili.
- Umlando womndeni: Abesifazane abaye bakhulelwa futhi babeletha izingane eziningana kakade kungenzeka ukuthi banamawele. Nakuba ukukhulelwa kwangaphambilini kungabangeli ukukhukhumeza noma kubangele amawele, kungenzeka ukuthi isibeletho sikamama sisaba nezihambi zokwamukela ukukhulelwa kwamabili.
- Ubudala bomama: Njengoba owesifazane ekhula, cishe kungenzeka akhiqize amaqanda angaphezu kweyodwa ngesikhathi. Lokhu kungase kube umzamo womzimba ophuthumayo wokuzala ngaphambi kokuba isikhathi siphele. Abesifazane abangaphezu kweminyaka engama-30 banamathuba okuba namawele, futhi izinga landa ngisho nangaphezulu ngemuva kweminyaka engama-35.
- Ukuphakama kwesibalo kanye nomzimba we-mass mass (BMI) : Abesifazane abakhulile banesilinganiso esiphakeme kunazo zonke zokukhulelwa kwamawele amabili. Izizathu azikho ikakhulukazi, kodwa mhlawumbe kungenxa yokuthi ukuphakama okukhudlwana kuhlotshaniswa nokudla okungcono, noma ukuphakama okungeziwe kuhlinzeka ngenye indawo esibelethweni, okwenza ukukhulelwa okuningi kube lula ukukhula. Abesifazane abane-BMI engama-30 noma ngaphezulu banamathuba amaningi kunokuba namawele, kuyilapho abesifazane abane-BMI abangaphansi kuka-20 bengaphansi kakhulu.
- Umjaho : Amakhosikazi ase-Afrika akhiqiza inani eliphakeme lamawele kunabesifazane base-Asia.
- Ukubhema : Uma ubhema, ungase ube nenengozi enkulu yokuba namawele, kodwa izifundo zilinganiselwe kule nhlanganisela.
> Imithombo:
> Campbell D, Thompson B, Pritchard C, Samphier M. Ingabe Ukusetshenziswa Kokuvimbela Umlomo Kucindezela Ama-Twinning Rates? Acta geneticae medicae et gemellologiae: Ucwaningo lwamabili . 1987; 36 (3): 409-415. i-doi: 10.1017 / S0001566000006176.
> Hoekstra C, Zhao ZZ, Lambalk CB, et al. I-Dizygotic Twinning. Ukuvuselela Ukukhiqizwa Komuntu. NgoJanuwari 1, 2008; 14 (1): 37-47. i-doi: 10.1093 / i-humupd / dmm036.
> Murphy MF, Campbell MJ, Bone M. Ingabe Kukhona Ingozi Ekhulayo Yokuqothula Ngemuva kokuqedwa kwePilisi Yokuvimbela Umlomo? Journal of Epidemiology and Health Community . 1989; 43 (3): 275-279.
> I-Rothman K. Fetal Loss, Ukuqothula kanye nokulinganisa ukuzalwa emva kokusetshenziswa komlomo-Ukukhulelwa komzimba. NEJM , September 1, 1977; 297: 468-471. i-doi: 10.1056 / NEJM197709012970903.