Lapho ukhuluma ngezinhlobo zamawele, izinhlobo ezimbili ziyaziwa kabanzi. Amafomu afanayo (noma ama- monozygotic ) afana neqanda elilodwa elikhulelwe elihlukanisa; amafomu (noma ama- dizygotic ) amafomu amafomu avela ezinhlanganeni ezimbili ezihlukene ezidalwa yenkomo / yeqanda. Kodwa i- polar body twinning iyigama elisetshenziselwa ukuchaza uhlobo olwesithathu lwama-twinning okwenzeka lapho i-ovum engavunyelwe ihlukaniswa zibe izingxenye ezingalingani bese kuthi ingxenye ngayinye ikhiqizwa izidalwa ezimbili ezihlukene.
Yeka ukuthi amawele omzimba we-polar ayenzeka kanjani
I-ova, isisini sesitholi sobulili, iqhutshwa inqubo yokwahlukana okuthiwa i-meiosis yokuzala. Le nqubo ikhiqiza amangqamuzana amane omndeni wama-haploid, ngalinye libe nesigamu se-chromosomes. Enye yezine i-egg cell (i-oocyte) kanti ezinye ezintathu zibizwa ngokuthi izidumbu ze-polar. Ngokuvamile, i-oocyte kuphela etholakalayo ekukhuliseni, kuyilapho izidumbu ze-polar ziphela. Kodwa ngokulandela inkolelo ye-polar body twinning, i-oocyte kanye nomzimba we-polar kuzoba ngandlela-thile ibe nomanyolo futhi uthuthuke, okwenza amawele.
Ingabe amawele ami ama-Polar Body Twins?
I-polar body twinning ingumqondo noma inkolelo. Azikho amacala ahlonishwayo amawele we-polar futhi ayikho indlela yokukhomba noma yokuqinisekisa noma i-polar body twinning. Nakuba kungase kube okuthakazelisayo ukucabangela ukuthi amawele akho afana, kepha akufani ncamashi, ayikho indlela yokwazi ngokuqinisekile ukuthi ingamawele we-polar body. Lapho ukuhlolwa kwe-zygosity kungaqinisekisa ukuthi amawele angama-monozygotic noma ama-dizygotic, izinkampani ezenza ukuhlolwa kwe-zygosity ukuthola uhlobo lwe-twin aluniki ukuhlolwa kwamawele womzimba we-polar.
Ingabe amawele omzimba we-Polar ahlukile?
Lapho amawele afana nawo avela ku-zygote ofanayo futhi anezici ezifuywayo, amawele asondelene anesigamu sezakhi zawo zofuzo ngokufanayo, afana nanoma yikuphi ukuzalwa kwabantwana. Ngakho-ke kulandela ukuthi amawele emzimbeni we-polar azoba neqoqo elifanayo lezakhi zofuzo ezivela kumama wabo, kodwa ukuhluka okuningi emajeni avela kuyise.
Ngokwemfundiso, amawele omzimba we-polar ahlanganyela cishe ngamaphesenti angama-75 wezimpawu zabo zofuzo, angaphansi kwamawele afanayo kodwa ngaphezulu kunamawele asondelene. Mhlawumbe babukeka befana kakhulu, kodwa hhayi ngendlela efanayo.
I-polar body twinning ngezinye izikhathi ichazwa njengejubane elifanayo elifanayo. Ihlukaniswe nokuhlanjululwa okufanayo okufanayo, lapho umuthi amabili uveza khona iqanda elilodwa ngoba iqanda lihlukanisa ngaphambi kokukhulelwa. Nakuba kuqinisekisiwe ukuthi i-twinning efana neyodwa eqinisekisiwe, i-polar body twinning ihlala iyingqayizivele.
> Imithombo:
I-Australian Twin Registry. "Yiziphi izinhlobo zokuqothula?" Ifinyelele ngo-Februwari 12, 2016. http://www.twins.org.au/twins-and-twin-families/twin-resources/faq#twinning
Moskwinski, R., Ed. Amawele okukhupha: I-Manual Complete for Parents of Multiple Births Children. I-Harpeth House Publishing: 2002. Phrinta.
> I-Genetics esebenzayo. "Ziyini ama-Polar Body Twins?" Kufinyelelwe ngo-Februwari 12, 2016. http://www.proactivegenetics.com/faq-twins-genetics.html#56.
Wells, D. noHillier, SG "Imizimba ye-polar: imfihlakalo yabo yezinto eziphilayo kanye nencazelo yomtholampilo." Ukukhiqizwa Kwabantu Bama-Molecular. Umqulu 17, Issue 5, Meyi 2011.