Izingane ezizalwa ngokukhulelwa okuningi zibizwa ngamawele noma amawele (triplets). Futhi kunezindlela ezimbili zokuthuthukiswa kokukhulelwa ngamawele: ama-dizygotic (amahlangothi amabili) namaphande afanayo.
Uyini umehluko phakathi kwamawele namawele?
Uma kwenzeka amawele amabili ama-jawed, owesifazane ukhula ngesikhathi esisodwa noma ngaphezulu kwe- ova eyodwa noma kokubili ama-ovari, okwathi ngemva kwalokho akhule ngempumelelo. Ngezinye izikhathi isikhathi sokukhulelwa kwabo sihlukile kwamahora ambalwa noma ngisho nezinsuku. Izingane ezizalwa zingaba nobulili obufanayo noma zibe nobulili obuhlukile. Ngokwenza kanjalo, banamakhemikhali ama-chromosomes, ngakho-ke kaningi ababukeka ngendlela efanayo, nakuba ukungafani okunye kuqinisekisiwe.
Ngezimpondo ze-monozygotic (odnoyaytsevymi), isimo sinjengalokhu: Iqanda elilodwa lihlonywa yi-spermatozoon eyodwa. Emva kwalokho, i-zygote ihlukaniswe yaba imibungu emibili ehlukene, ekhula futhi ikhule ibe izingane ezimbili ezikhangayo. Ngesikhathi esifanayo njengomphumela wokukhulelwa, abafana bavame ukuzalwa, okuyikho amakhophi omunye nomunye.
Izinkinga zokuthuthukiswa kwamawele (amawele)
Phakathi kwezinye izimo ezinzima zokukhulelwa okuningi ukuthuthukiswa kwamawele. Amawele ahlukanisiwe ukulibazisa ekukhuleni kwesinye sezithelo. Okusho ukuthi enye yezingane iqala kangcono, igxile okwesibili. Inketho eyingozi kunazo zonke lapho amawele amabili aphethwe ngamaplancenta aphelelana. Kulesi simo, impilo yabantwana ababili isengozini.
Olunye uhlobo lwezinkinga kukhona amawele e-Siamese. Lolu hlobo lwamamawele ngamawele afanayo, ahlangane omunye nomunye. Isizathu salezi zenzakalo ngokuhlukaniswa okungenakwenzeka kwe-zygote zibe amafomu amabili azimele. Ngenhlanhla, lesi senzakalo senzeke ku-1 nje kuphela kwezigidi ezingu-10.